Hello teacher. This is we work about Supernovas.Here is we introduction:
This work is going to talk about the Supernovas, the types of supernovas, their history and the importance for us.We chose this topic because we think, this is a very relevant topic for us, because one of the explosions of a supernova got place to the solar system , this is the reason why we got live, we breath , we are study now. Besides we like the Astronomy and the geography because it’s exciting to study the planets that are very far away from us.Well, as we know a supernova is a stellar explosion that creates an extremely luminous object. A supernova causes a burst of radiation that may briefly outshine its entire host galaxy before fading from view over several weeks or months. During this short interval, a supernova can radiate as much energy as the Sun would emit over 10 billion years.Supernovas fall into two classes: those focused on relatively nearby events and those looking for explosions farther away.Type AOne model for the formation of this category of supernova is a close binary star system. The larger of the two stars is the first to evolve off the main sequence, and it expands to form a red giant. The two stars now are sharing a common envelope, causing their mutual orbit to shrink.The giant star then sheds most of its envelope, losing mass until it can no longer continue nuclear fusion. At this point it becomes a white dwarf star, composed primarily of carbon and oxygen. Eventually the secondary star also evolves off the main sequence to form a red giant. Matter from the giant is accreted by the white dwarf, causing the latter to increase in mass.
Type BThese events, like supernovae of Type II, are massive stars running out of fuel at their centers; however the progenitors of Types Ib and Ic have lost most of their outer (hydrogen) envelopes due to strong stellar winds or else from interaction with a companion. Type Ib supernova are thought to be the result of the collapse of a massive Wolf-Rayet star. There is some evidence that a few percent of the Type Ic supernova may be the progenitors of gamma ray bursts(GRB), though it is also believed that any hydrogen-stripped, Type Ib or Ic supernova could be a GRB, dependent upon the geometry of the explosion.The impact of a supernova on EarthIn Earth's case, gamma rays induce a chemical reaction in the upper atmosphere, converting molecular nitrogen into nitrogen oxides, depleting the ozone layer enough to expose the surface to harmful solar and cosmic radiation. The gamma ray burst from a nearby supernova explosion has been proposed as the cause of the end Ordovician extinction, which resulted in the death of nearly 60% of the oceanic life on Earth.
Well, this is only the introduction of this relevant and interesting topic, you’ll find impressive images of the cycle of the supernovas, later you will check our presentation.
And this is a little information of Supernovas:
Heavyweight Remnant of a Supernova
A neutron Star is the smoking gun at the scene of a Supernova explosion. The inmense presure and heat in the Supernovas iron core at the moment of the explosion create a neutron start by forcing oppositely chargea electrons and protons so close together that they fuse to become neutrons. Inside an iron shell only a few hundred feet thick these neutrons pack together into matter so dense that a single teaspoonful could weigh a billion tons. Though no more than perhaps ten miles in diameter, the neutron star has a gravitational field at its surface 100 billion times as strong as that on the surface of the Earth.
The Suepernova explosion that forms a neutron star also expels vast numbers of nearly massless particles called neutrinos, as well as an expanding cloud of dust and gas that can remain visible for thousands of years.
Well, this is we work. See you next class.
martes, 4 de diciembre de 2007
martes, 27 de noviembre de 2007
Information of Supernovas
Hello teacher Marsella!!!!
This week we couldn't work on the Mediateca because it wasn't on service.
I worked on my house with Diana and this is our information:
The supernovas are heavenly bodies that are on explosion danger. If a supernova explodes with it, can cause the origin of a new start. The Big Bang was a Supernova that origin the Solar sistem and that is important for us.
We will talk about the Solar Sistem origin:
When the Universe have just stars and doesn't exist planets, have a big explosion caused for a star. This explosion caused a big cloud of gas and cosmic powder. These materials were joined together to create the planets and their satellites. This formation create the Milk way and
the life on the third planet of the Solar Sistem: "the Earth."
It's fabolous for us to know that the Earth was a “trash” of the space and then it was the result of a Supernova. We think that the life on the Earth is fantastic and his history is very important for all the people that live in this planet.
Well…this could be the introduction of our work and we go to work on a presentation in Power Point.
Our bibliography is:
O., Monticelli, New Tematic Encyclopaedia, Paraguay, Richards editorial, 7ª edition, 535 pages, 1967.
Ríos, Magdalena, Atlas Universal and of México, Mexico DF, Trillas editorial, 96 pages, 2001.
Mitchell Beazley Encyclopaedias Limited, The Eartht, Spain, Salvat editorial, 125 pages, 1985.
Content:
A supernova is a stellar explosion that creates an extremely luminous object. A supernova causes a burst of radiation that may briefly outshine its entire host galaxy before fading from view over several weeks or months. During this short interval, a supernova can radiate as much energy as the Sun would emit over 10 billion years.This is so surprising; can you ever imagine this power that has the supernovas?The explosion throws materials a velocity of up to a tenth the speed of light, driving a shock wave into the surrounding interstellar medium. This shock wave sweeps up an expanding shell of gas and dust called a supernova remnant.Several types of supernovae exist that may be triggered in one of two ways, involving either turning off or suddenly turning on the production of energy through nuclear fusion. After the core of an aging massive star ceases to generate energy from nuclear fusion, it may undergo sudden gravitational collapse into a neutron star or black hole, releasing gravitational potential energy that heats and expels the star's outer layers.Supernova in other galaxies cannot be predicted with any meaningful accuracy. When they are discovered, they are already in progress. Most scientific interest in supernovae—as standard candles for measuring distance, for example—require an observation of their peak luminosity. It is therefore important to discover them well before they reach their maximum. Amateur astronomers, who greatly outnumber professional astronomers, have played an important role in finding supernovae, typically by looking at some of the closer galaxies through an optical telescope and comparing them to earlier photographs.Supernova searches fall into two classes: those focused on relatively nearby events and those looking for explosions farther away. Because of the expansion of the universe, the distance to a remote object with a known emission spectrum can be estimated by measuring its Doppler shift (or redshift); on average, more distant objects recede with greater velocity than those nearby, and so have a higher redshift. Thus the search is split between high redshift and low redshift, with the boundary falling around a redshift range of z = 0.1–0.3—where z is a dimensionless measure of the spectrum's frequency shift.Tape AOne model for the formation of this category of supernova is a close binary star system. The larger of the two stars is the first to evolve off the main sequence, and it expands to form a red giant. The two stars now share a common envelope, causing their mutual orbit to shrink. The giant star then sheds most of its envelope, losing mass until it can no longer continue nuclear fusion. At this point it becomes a white dwarf star, composed primarily of carbon and oxygen. Eventually the secondary star also evolves off the main sequence to form a red giant. Matter from the giant is accreted by the white dwarf, causing the latter to increase in mass.TYPE BThese events, like supernovae of Type II, are probably massive stars running out of fuel at their centers; however, the progenitors of Types Ib and Ic have lost most of their outer (hydrogen) envelopes due to strong stellar winds or else from interaction with a companion. Type Ib supernovae are thought to be the result of the collapse of a massive Wolf-Rayet star. There is some evidence that a few percent of the Type Ic supernovae may be the progenitors of gamma ray bursts (GRB), though it is also believed that any hydrogen-stripped, Type Ib or Ic supernova could be a GRB, dependent upon the geometry of the explosion.Impact on EarthA near-Earth supernova is an explosion resulting from the death of a star that occurs close enough to the Earth (roughly fewer than 100 light-years away) to have noticeable effects on its biosphere. Gamma rays are responsible for most of the adverse effects a supernova can have on a living terrestrial planet. In Earth's case, gamma rays induce a chemical reaction in the upper atmosphere, converting molecular nitrogen into nitrogen oxides, depleting the ozone layer enough to expose the surface to harmful solar and cosmic radiation. The gamma ray burst from a nearby supernova explosion has been proposed as the cause of the end Ordovician extinction, which resulted in the death of nearly 60% of the oceanic life on Earth.Speculation as to the effects of a nearby supernova on Earth often focuses on large stars as Type II supernova candidates. Several prominent stars within a few hundred light years from the Sun are candidates for becoming supernovae in as little as a millennium. One example is Betelgeuse, a red supergiant 427 light-years from Earth. Though spectacular, these "predictable" supernovae are thought to have little potential to affect Earth.Recent estimates predict that a Type II supernova would have to be closer than eight parsecs (26 light-years) to destroy half of the Earth's ozone layer.Such estimates are mostly concerned with atmospheric modeling and considered only the known radiation flux from SN 1987A, a Type II supernova in the Large Magellanic Cloud. Estimates of the rate of supernova occurrence within 10 parsecs of the Earth vary from once every 100 million years to once every one to ten billion years.Type Ia supernovae are thought to be potentially the most dangerous if they occur close enough to the Earth. Because Type Ia supernovae arise from dim, common white dwarf stars, it is likely that a supernova that could affect the Earth will occur unpredictably and take place in a star system that is not well studied. One theory suggests that a Type IA supernova would have to be closer than a thousand parsecs (3300 light-years) to affect the Earth.
Opinion:We think this is an incredible topic, it had a lot of information, and it gave me surprised, of the power of supernovas have, this is incredible.Well, we want also to make a type of presentation, because the images that we got were annoyed.I think the world of the universe is amazing.
Welll teacher, this was we work. See you next class.
This week we couldn't work on the Mediateca because it wasn't on service.
I worked on my house with Diana and this is our information:
The supernovas are heavenly bodies that are on explosion danger. If a supernova explodes with it, can cause the origin of a new start. The Big Bang was a Supernova that origin the Solar sistem and that is important for us.
We will talk about the Solar Sistem origin:
When the Universe have just stars and doesn't exist planets, have a big explosion caused for a star. This explosion caused a big cloud of gas and cosmic powder. These materials were joined together to create the planets and their satellites. This formation create the Milk way and
the life on the third planet of the Solar Sistem: "the Earth."
It's fabolous for us to know that the Earth was a “trash” of the space and then it was the result of a Supernova. We think that the life on the Earth is fantastic and his history is very important for all the people that live in this planet.
Well…this could be the introduction of our work and we go to work on a presentation in Power Point.
Our bibliography is:
O., Monticelli, New Tematic Encyclopaedia, Paraguay, Richards editorial, 7ª edition, 535 pages, 1967.
Ríos, Magdalena, Atlas Universal and of México, Mexico DF, Trillas editorial, 96 pages, 2001.
Mitchell Beazley Encyclopaedias Limited, The Eartht, Spain, Salvat editorial, 125 pages, 1985.
Content:
A supernova is a stellar explosion that creates an extremely luminous object. A supernova causes a burst of radiation that may briefly outshine its entire host galaxy before fading from view over several weeks or months. During this short interval, a supernova can radiate as much energy as the Sun would emit over 10 billion years.This is so surprising; can you ever imagine this power that has the supernovas?The explosion throws materials a velocity of up to a tenth the speed of light, driving a shock wave into the surrounding interstellar medium. This shock wave sweeps up an expanding shell of gas and dust called a supernova remnant.Several types of supernovae exist that may be triggered in one of two ways, involving either turning off or suddenly turning on the production of energy through nuclear fusion. After the core of an aging massive star ceases to generate energy from nuclear fusion, it may undergo sudden gravitational collapse into a neutron star or black hole, releasing gravitational potential energy that heats and expels the star's outer layers.Supernova in other galaxies cannot be predicted with any meaningful accuracy. When they are discovered, they are already in progress. Most scientific interest in supernovae—as standard candles for measuring distance, for example—require an observation of their peak luminosity. It is therefore important to discover them well before they reach their maximum. Amateur astronomers, who greatly outnumber professional astronomers, have played an important role in finding supernovae, typically by looking at some of the closer galaxies through an optical telescope and comparing them to earlier photographs.Supernova searches fall into two classes: those focused on relatively nearby events and those looking for explosions farther away. Because of the expansion of the universe, the distance to a remote object with a known emission spectrum can be estimated by measuring its Doppler shift (or redshift); on average, more distant objects recede with greater velocity than those nearby, and so have a higher redshift. Thus the search is split between high redshift and low redshift, with the boundary falling around a redshift range of z = 0.1–0.3—where z is a dimensionless measure of the spectrum's frequency shift.Tape AOne model for the formation of this category of supernova is a close binary star system. The larger of the two stars is the first to evolve off the main sequence, and it expands to form a red giant. The two stars now share a common envelope, causing their mutual orbit to shrink. The giant star then sheds most of its envelope, losing mass until it can no longer continue nuclear fusion. At this point it becomes a white dwarf star, composed primarily of carbon and oxygen. Eventually the secondary star also evolves off the main sequence to form a red giant. Matter from the giant is accreted by the white dwarf, causing the latter to increase in mass.TYPE BThese events, like supernovae of Type II, are probably massive stars running out of fuel at their centers; however, the progenitors of Types Ib and Ic have lost most of their outer (hydrogen) envelopes due to strong stellar winds or else from interaction with a companion. Type Ib supernovae are thought to be the result of the collapse of a massive Wolf-Rayet star. There is some evidence that a few percent of the Type Ic supernovae may be the progenitors of gamma ray bursts (GRB), though it is also believed that any hydrogen-stripped, Type Ib or Ic supernova could be a GRB, dependent upon the geometry of the explosion.Impact on EarthA near-Earth supernova is an explosion resulting from the death of a star that occurs close enough to the Earth (roughly fewer than 100 light-years away) to have noticeable effects on its biosphere. Gamma rays are responsible for most of the adverse effects a supernova can have on a living terrestrial planet. In Earth's case, gamma rays induce a chemical reaction in the upper atmosphere, converting molecular nitrogen into nitrogen oxides, depleting the ozone layer enough to expose the surface to harmful solar and cosmic radiation. The gamma ray burst from a nearby supernova explosion has been proposed as the cause of the end Ordovician extinction, which resulted in the death of nearly 60% of the oceanic life on Earth.Speculation as to the effects of a nearby supernova on Earth often focuses on large stars as Type II supernova candidates. Several prominent stars within a few hundred light years from the Sun are candidates for becoming supernovae in as little as a millennium. One example is Betelgeuse, a red supergiant 427 light-years from Earth. Though spectacular, these "predictable" supernovae are thought to have little potential to affect Earth.Recent estimates predict that a Type II supernova would have to be closer than eight parsecs (26 light-years) to destroy half of the Earth's ozone layer.Such estimates are mostly concerned with atmospheric modeling and considered only the known radiation flux from SN 1987A, a Type II supernova in the Large Magellanic Cloud. Estimates of the rate of supernova occurrence within 10 parsecs of the Earth vary from once every 100 million years to once every one to ten billion years.Type Ia supernovae are thought to be potentially the most dangerous if they occur close enough to the Earth. Because Type Ia supernovae arise from dim, common white dwarf stars, it is likely that a supernova that could affect the Earth will occur unpredictably and take place in a star system that is not well studied. One theory suggests that a Type IA supernova would have to be closer than a thousand parsecs (3300 light-years) to affect the Earth.
Opinion:We think this is an incredible topic, it had a lot of information, and it gave me surprised, of the power of supernovas have, this is incredible.Well, we want also to make a type of presentation, because the images that we got were annoyed.I think the world of the universe is amazing.
Welll teacher, this was we work. See you next class.
martes, 20 de noviembre de 2007
Homework: Supernovas
Hello teacher Marsella. Well this we work of the Supernovas. This is some information about the Supernovas .
INTRODUCTION
We choose the topic of Supernova because we think that the universe is another world in which we represent a minimum part of that whole world. The origin of the universe is the most important for us because we live here, so we are going to talk about the Supernovas.
These heavenly bodies are the cause of the live in the Earth because the explosion of the Big Bang was a supernova.
CONTENT
The supernovas are stars in explosion danger that to produce a fusion of elements on the interior of the start that can to create an extremely luminous object. The explosion of a supernova can cause a new start. These are the origin of a dark hole, too. The results of this explosion are wonderful: the explosion cause a big energy center that is as the solar energy for ten years. Is incredible the energy that a star have.
The supernovas have a “little sisters” that are the novas. This heavenly bodies are stars very bright that have cosmic powder in it interior. When this bodies to exploit, can be brigthest.
The supernovas are classifying in:
TIPE I:. This tipe include at the supernovas of tipe Ia, Ib and Ic.
Tipe Ia: it is the explosion of the little stars of white color. These supernovas haven’t Hydrogen and have ions of silicon.
Tipe Ib: it haven’t Helio.
Tipe Ic: the Helio that is in it interior is weak or don’t exist and cause the gamma rays.
TIPE II: are the stars with 9 times the solar mass.
The supernovas are importants in we life because the universe origin was caused for this heavenly body. Remember that the Big- Bang explosion was a shok between two planets and it material was dispersed for all the space and cause the accumulation of this material for the trainig of news planets.
CONCLUSION
Well, the Supernovas are importants for we because the Universe was origined for a explosion of this tipe and because the contact with the Earth can cause a big production of energy that cause damage the normal functioning of the electric things in the continents.
Well, I think that it's good and see you next class teacher.
P.S. I chose the topic of Supernovas because I think that the Universe origin is the most important in the life of the humans. The cause of the explosion called Big Bang is the content of this topic because this explosion was a Supernova.
This work like me very much because the life is a mistery and all we have that ask these questions.
INTRODUCTION
We choose the topic of Supernova because we think that the universe is another world in which we represent a minimum part of that whole world. The origin of the universe is the most important for us because we live here, so we are going to talk about the Supernovas.
These heavenly bodies are the cause of the live in the Earth because the explosion of the Big Bang was a supernova.
CONTENT
The supernovas are stars in explosion danger that to produce a fusion of elements on the interior of the start that can to create an extremely luminous object. The explosion of a supernova can cause a new start. These are the origin of a dark hole, too. The results of this explosion are wonderful: the explosion cause a big energy center that is as the solar energy for ten years. Is incredible the energy that a star have.
The supernovas have a “little sisters” that are the novas. This heavenly bodies are stars very bright that have cosmic powder in it interior. When this bodies to exploit, can be brigthest.
The supernovas are classifying in:
TIPE I:. This tipe include at the supernovas of tipe Ia, Ib and Ic.
Tipe Ia: it is the explosion of the little stars of white color. These supernovas haven’t Hydrogen and have ions of silicon.
Tipe Ib: it haven’t Helio.
Tipe Ic: the Helio that is in it interior is weak or don’t exist and cause the gamma rays.
TIPE II: are the stars with 9 times the solar mass.
The supernovas are importants in we life because the universe origin was caused for this heavenly body. Remember that the Big- Bang explosion was a shok between two planets and it material was dispersed for all the space and cause the accumulation of this material for the trainig of news planets.
CONCLUSION
Well, the Supernovas are importants for we because the Universe was origined for a explosion of this tipe and because the contact with the Earth can cause a big production of energy that cause damage the normal functioning of the electric things in the continents.
Well, I think that it's good and see you next class teacher.
P.S. I chose the topic of Supernovas because I think that the Universe origin is the most important in the life of the humans. The cause of the explosion called Big Bang is the content of this topic because this explosion was a Supernova.
This work like me very much because the life is a mistery and all we have that ask these questions.
jueves, 8 de noviembre de 2007
Web pages about the Supernovas
Hello teacher Marsella. I'm writig to talk about my topic. My favoritre topic was Supernovas and like me because I love things that are out the Earth. The astronomy is my favorite Science because I think that the Universe creation is a thing important in the life of each human. The Web page that we (Diana and me) search were:
www.en.wikipedia.org/wiki/Supernova
www.heasarc.gsfc.nasa.gov/docs/snr.html
www.space.com/supernovas/
www.chandra.harvard.edu/xray_sources/supernovas.
www.nmm.ac.uk/server/show/conWebDoc.300
www.science.nasa.gov/headlines/y2003/06jan_bubble.htm
http://www.corsacentre.com/
www.space.com/scienceastronomy/060220_mm_sound_supernova.html
www.harvard.edu/cfa/oir/Research/supernova/highz/figures/index.html
www.supernovae.net/snimages/snlinks.html
www.cfa.harvard.edu/supernova/SNlinks.html
Well teacher, this was my homework. See you next class.Have a nice day
www.en.wikipedia.org/wiki/Supernova
www.heasarc.gsfc.nasa.gov/docs/snr.html
www.space.com/supernovas/
www.chandra.harvard.edu/xray_sources/supernovas.
www.nmm.ac.uk/server/show/conWebDoc.300
www.science.nasa.gov/headlines/y2003/06jan_bubble.htm
http://www.corsacentre.com/
www.space.com/scienceastronomy/060220_mm_sound_supernova.html
www.harvard.edu/cfa/oir/Research/supernova/highz/figures/index.html
www.supernovae.net/snimages/snlinks.html
www.cfa.harvard.edu/supernova/SNlinks.html
Well teacher, this was my homework. See you next class.Have a nice day
Supernova
November 1, 2007
Christine PulliamHarvard Smithsonian Center for Astrophysics
Astronomers at the Harvard-Smithsonian Center for Astrophysics (CfA) have found that a supernova discovered last year was caused by two colliding white dwarf stars. The white dwarfs were siblings orbiting each other. They slowly spiraled inward until they merged, touching off a titanic explosion. CfA observations show the strongest evidence yet of what was, until now, a purely theoretical mechanism for creating a supernova.
"This finding shows that nature may be richer than we suspected, with more than one way to make a white dwarf explode," said Harvard graduate student and first author Malcolm Hicken.
The paper describing this discovery appeared in the November 1st issue of The Astrophysical Journal Letters.
Astronomers characterize an observed supernova based on whether its spectrum shows evidence of hydrogen (Type II) or not (Type I). In Type II, a massive, short-lived star undergoes core collapse and explodes. In the conventional picture for Type Ia, the most common supernovae lacking hydrogen, a white dwarf star collects gas from a companion star until it undergoes catastrophic nuclear fusion and blasts itself apart.
The new find, supernova 2006gz, was classified as a Type Ia due to the lack of hydrogen and other characteristics. However, an analysis combining CfA data with measurements from The Ohio State University suggested that SN 2006gz was unusual and deserved a closer look.
Most importantly, SN 2006gz showed the strongest spectral signature of unburned carbon ever seen. Merging white dwarfs are expected to have carbon outside their densest regions. The powerful explosion from the inside then should push off the outmost carbon-rich layers.
The spectrum of SN 2006gz also showed evidence for compressed layers of silicon. Silicon was created during the explosion and then compressed by a shock wave that rebounded from the surrounding layers of carbon and oxygen.
Computer models for merging white dwarfs predict both the carbon and silicon spectral signatures.
Additionally, SN 2006gz was brighter than expected, indicating that its progenitor exceeded the 1.4 solar mass Chandrasekhar limit - the upper bound for a single white dwarf. Only one other potential example of a super-Chandrasekhar supernova has been seen: SN 2003fg. While observations of that event were suggestive, the data from SN 2006gz are much stronger.
"Our case is different. Although 2006gz is also extra bright, the chemistry we see, particularly unburned carbon, is well observed and very unusual," said Harvard astronomer Robert Kirshner, a member of the discovery team.
In addition to providing the first example of a new way to make supernovae, SN 2006gz holds implications for the field of cosmology. Type Ia supernovae typically have a narrow spread in brightness, which makes them useful as "standard candles" for calculating cosmic distances. It was the study of Type Ia supernovae that led to the discovery of dark energy, the mysterious force causing the expansion of the universe to accelerate.
If Type Ia supernovae are more varied than previously expected, then astronomers must be extra cautious when using them to study the cosmos.
"Supernova 2006gz stands out from normal Type Ia objects and wouldn't be included in cosmology studies," commented Hicken. "But we have to be careful not to mistake a double white dwarf explosion for a single white dwarf blast. SN 2006gz was easy to recognize, but there may be less clear-cut cases."
The full list of authors of the study is: Malcolm Hicken, Stéphane Blondin and Robert Kirshner (CfA); Peter Garnavich (University of Notre Dame); Jose Prieto and Darren DePoy (The Ohio State University); and Jerod Parrent (University of Oklahoma). This research was supported by the National Science Foundation.
Christine PulliamHarvard Smithsonian Center for Astrophysics
Astronomers at the Harvard-Smithsonian Center for Astrophysics (CfA) have found that a supernova discovered last year was caused by two colliding white dwarf stars. The white dwarfs were siblings orbiting each other. They slowly spiraled inward until they merged, touching off a titanic explosion. CfA observations show the strongest evidence yet of what was, until now, a purely theoretical mechanism for creating a supernova.
"This finding shows that nature may be richer than we suspected, with more than one way to make a white dwarf explode," said Harvard graduate student and first author Malcolm Hicken.
The paper describing this discovery appeared in the November 1st issue of The Astrophysical Journal Letters.
Astronomers characterize an observed supernova based on whether its spectrum shows evidence of hydrogen (Type II) or not (Type I). In Type II, a massive, short-lived star undergoes core collapse and explodes. In the conventional picture for Type Ia, the most common supernovae lacking hydrogen, a white dwarf star collects gas from a companion star until it undergoes catastrophic nuclear fusion and blasts itself apart.
The new find, supernova 2006gz, was classified as a Type Ia due to the lack of hydrogen and other characteristics. However, an analysis combining CfA data with measurements from The Ohio State University suggested that SN 2006gz was unusual and deserved a closer look.
Most importantly, SN 2006gz showed the strongest spectral signature of unburned carbon ever seen. Merging white dwarfs are expected to have carbon outside their densest regions. The powerful explosion from the inside then should push off the outmost carbon-rich layers.
The spectrum of SN 2006gz also showed evidence for compressed layers of silicon. Silicon was created during the explosion and then compressed by a shock wave that rebounded from the surrounding layers of carbon and oxygen.
Computer models for merging white dwarfs predict both the carbon and silicon spectral signatures.
Additionally, SN 2006gz was brighter than expected, indicating that its progenitor exceeded the 1.4 solar mass Chandrasekhar limit - the upper bound for a single white dwarf. Only one other potential example of a super-Chandrasekhar supernova has been seen: SN 2003fg. While observations of that event were suggestive, the data from SN 2006gz are much stronger.
"Our case is different. Although 2006gz is also extra bright, the chemistry we see, particularly unburned carbon, is well observed and very unusual," said Harvard astronomer Robert Kirshner, a member of the discovery team.
In addition to providing the first example of a new way to make supernovae, SN 2006gz holds implications for the field of cosmology. Type Ia supernovae typically have a narrow spread in brightness, which makes them useful as "standard candles" for calculating cosmic distances. It was the study of Type Ia supernovae that led to the discovery of dark energy, the mysterious force causing the expansion of the universe to accelerate.
If Type Ia supernovae are more varied than previously expected, then astronomers must be extra cautious when using them to study the cosmos.
"Supernova 2006gz stands out from normal Type Ia objects and wouldn't be included in cosmology studies," commented Hicken. "But we have to be careful not to mistake a double white dwarf explosion for a single white dwarf blast. SN 2006gz was easy to recognize, but there may be less clear-cut cases."
The full list of authors of the study is: Malcolm Hicken, Stéphane Blondin and Robert Kirshner (CfA); Peter Garnavich (University of Notre Dame); Jose Prieto and Darren DePoy (The Ohio State University); and Jerod Parrent (University of Oklahoma). This research was supported by the National Science Foundation.
martes, 30 de octubre de 2007
"Halloween" and "Dead's day"
These are the differences between Halloween and Dead's Day:
The Halloween is an American tradition where one likes sweets and will not be granted if there is a mischief. Also people use costumes beings fantastic. In Mexico, children come to "calaverear" to ask too sweet, but first they have to pray at the altar or ofrenda that are deployed and are not required to be disguised. I think that the Dead's Day is more traditional and more real.
The Halloween is an American tradition where one likes sweets and will not be granted if there is a mischief. Also people use costumes beings fantastic. In Mexico, children come to "calaverear" to ask too sweet, but first they have to pray at the altar or ofrenda that are deployed and are not required to be disguised. I think that the Dead's Day is more traditional and more real.
The Halloween
1.- What day of the month is Halloween?
October 31st
2.- Why is halloween celebrated?
Because it's an American tradition that has a lot of meaning and that to identify to the American people. The Mexicans celebrate the Halloween too, but here there is other tradition called "Dead's Day".
3.- Can you explain the history of Halloween?
Yes, the history of Halloween goes back since 3000 years, when the Celtics celebrated the day of the "Lord of the Dead" or the "Samhain" because they believe that the deads returns at the world for eat and to scare at the people. Later, the Romans changed the celebration because they used this day for the "day of harvest". After, the Christian church intervened to change the name and the day of the celebration and was called "All Hallow Day" and was celebrated on November 1st. The origin of the costumes was when the robbers used other dress for that the people don´t think that they was the robbers. This is the history of Halloween.
4.- How is Halloween celebrated in your country?
In Mexico, is celebrated the Dead's Day and the people have the tradition of to go to the cementeries and offering a "ofrenda" for to receive dead family . The ofrenda is colocated in the homes and they set bread, fruits and traditionals candys. The mexicans are very traditionals.
5.- Do you believe in ghosts?
Yes, I think in spirits and ghosts because are souls in penalty who live in solitude and that they have a mission on earth.
6.- What makes you afraid of ghosts?
Well, I'm afraid of alive people, not dead people.
7.- What are some of the symbols of Halloween?
Witches, pumpkins, bats, ghosts, skulls, spirits, black cats, superstition things, irreals worlds.
8.- What kind of costume are you going to wear to the Halloween party?
Like me the vampires that for my costume is going to be dark: a Vampireza
9.- Is your pumpkin still out ?
Well, I never asked calaverita.
10.- Are you still eating Halloween candy ?
Sweets are my weakness, taht for I eat candies all time.
Activity
1. The celebration of Samhain used to take two days.
False
2. Celtic tribes celebrated the end of summer on October 31st.
True
3. First jack-o-lanterns were carved from turnips.
True
4. Jack-o-lanterns were supposed to scare away evil spirits.
False
5. Samhain was the festival of satan.
False
6. Halloween was celebrated in America long before 1800's.
False
7. Irish settlers brought Halloween to America.
True
8. The souls of the dead were believed to be closest to this world on October 31st.
True
9.Burning twigs were used inside a pumpkin as a source of light.
True
10. Samhain meant "Summer's End".
True
October 31st
2.- Why is halloween celebrated?
Because it's an American tradition that has a lot of meaning and that to identify to the American people. The Mexicans celebrate the Halloween too, but here there is other tradition called "Dead's Day".
3.- Can you explain the history of Halloween?
Yes, the history of Halloween goes back since 3000 years, when the Celtics celebrated the day of the "Lord of the Dead" or the "Samhain" because they believe that the deads returns at the world for eat and to scare at the people. Later, the Romans changed the celebration because they used this day for the "day of harvest". After, the Christian church intervened to change the name and the day of the celebration and was called "All Hallow Day" and was celebrated on November 1st. The origin of the costumes was when the robbers used other dress for that the people don´t think that they was the robbers. This is the history of Halloween.
4.- How is Halloween celebrated in your country?
In Mexico, is celebrated the Dead's Day and the people have the tradition of to go to the cementeries and offering a "ofrenda" for to receive dead family . The ofrenda is colocated in the homes and they set bread, fruits and traditionals candys. The mexicans are very traditionals.
5.- Do you believe in ghosts?
Yes, I think in spirits and ghosts because are souls in penalty who live in solitude and that they have a mission on earth.
6.- What makes you afraid of ghosts?
Well, I'm afraid of alive people, not dead people.
7.- What are some of the symbols of Halloween?
Witches, pumpkins, bats, ghosts, skulls, spirits, black cats, superstition things, irreals worlds.
8.- What kind of costume are you going to wear to the Halloween party?
Like me the vampires that for my costume is going to be dark: a Vampireza
9.- Is your pumpkin still out ?
Well, I never asked calaverita.
10.- Are you still eating Halloween candy ?
Sweets are my weakness, taht for I eat candies all time.
Activity
1. The celebration of Samhain used to take two days.
False
2. Celtic tribes celebrated the end of summer on October 31st.
True
3. First jack-o-lanterns were carved from turnips.
True
4. Jack-o-lanterns were supposed to scare away evil spirits.
False
5. Samhain was the festival of satan.
False
6. Halloween was celebrated in America long before 1800's.
False
7. Irish settlers brought Halloween to America.
True
8. The souls of the dead were believed to be closest to this world on October 31st.
True
9.Burning twigs were used inside a pumpkin as a source of light.
True
10. Samhain meant "Summer's End".
True
Halloween's questionary
The questionary that I did was:
1.- Were is the Samhain celebration from?
It is from the Celtic civilization.
2.- Wath is the Samhain?
It's the name of the festival and mean "Summer's End"
3.- Satan was a creation of:
The Christian church.
4.- The people set jack-o-lenterns in a windows for:
To receive relatives familiars and as protection against malevolent spirits.
5.- The Europeans discovered the pumpkin on:
America.
6.- Moreover, Halloween is:
A celebration of the harvest.
7.- Halloween is a best moment for:
Be on contact with the dead to say good bye or ask for assistance.
8.- When is celebrate the Halloween?
Is celebrated since the sundown on October 31st.
9.- The Samhain have been to celebrated since:
3,000 years ago
10.- The jack-o-lenterns were carved on:
The pumpkins and turnips.
1.- Were is the Samhain celebration from?
It is from the Celtic civilization.
2.- Wath is the Samhain?
It's the name of the festival and mean "Summer's End"
3.- Satan was a creation of:
The Christian church.
4.- The people set jack-o-lenterns in a windows for:
To receive relatives familiars and as protection against malevolent spirits.
5.- The Europeans discovered the pumpkin on:
America.
6.- Moreover, Halloween is:
A celebration of the harvest.
7.- Halloween is a best moment for:
Be on contact with the dead to say good bye or ask for assistance.
8.- When is celebrate the Halloween?
Is celebrated since the sundown on October 31st.
9.- The Samhain have been to celebrated since:
3,000 years ago
10.- The jack-o-lenterns were carved on:
The pumpkins and turnips.
jueves, 18 de octubre de 2007
Comments
Hello, this is my comment of the topic of my friends:
Moraarredondo: He is a boy that chose a very good topic because the logic is wonderful for the person's life.
The puzzle about his family is interesting and his questionary was important. His work is good.
Kejikus: His work is about the Galapagos Islands and it will be interesting because this is a game. The homework is wonderful.
Victor Arrieta: his work is about the Salem Wiches and is exciting that somebody is interesting in this problem that to expresa a danger for the world.
Ricardo: his topic is the Galapagos Islands too and it's a game of animals. I think that his work is good.
Manuel: his topic is about the animals that live on the Ocean and I think that this topic is thge passion of Manuel because his topic is very interesting.
The topic of Ivonne is wonderful because choose the historic marc of the womens in the world.
Well, this is all and I think that my work is interesting because like me very much.
Bye , see you next class!!!!!!!!!!!
Moraarredondo: He is a boy that chose a very good topic because the logic is wonderful for the person's life.
The puzzle about his family is interesting and his questionary was important. His work is good.
Kejikus: His work is about the Galapagos Islands and it will be interesting because this is a game. The homework is wonderful.
Victor Arrieta: his work is about the Salem Wiches and is exciting that somebody is interesting in this problem that to expresa a danger for the world.
Ricardo: his topic is the Galapagos Islands too and it's a game of animals. I think that his work is good.
Manuel: his topic is about the animals that live on the Ocean and I think that this topic is thge passion of Manuel because his topic is very interesting.
The topic of Ivonne is wonderful because choose the historic marc of the womens in the world.
Well, this is all and I think that my work is interesting because like me very much.
Bye , see you next class!!!!!!!!!!!
Cleopatra's Palace
Hello!!!!
This is my report of my favorite topic for the English class in the Mediateca.
My topic is about Cleopatra's Palace and I've made a Web Page that shows her life, her family, her love with César (Roman Imperor) and with Marc Antony (a Roman soldier). The Cleopatra's life was wonderful but dramatic too. This topic was my favorite because I love Egypt and it is my passion. Its palaces, piramids and monuments were fantastic and this culture is exciting for me.
My Web page will be read the next Thursday and I will send the address so that my friends can see it.
Bye!!!!!!!!!
This is my report of my favorite topic for the English class in the Mediateca.
My topic is about Cleopatra's Palace and I've made a Web Page that shows her life, her family, her love with César (Roman Imperor) and with Marc Antony (a Roman soldier). The Cleopatra's life was wonderful but dramatic too. This topic was my favorite because I love Egypt and it is my passion. Its palaces, piramids and monuments were fantastic and this culture is exciting for me.
My Web page will be read the next Thursday and I will send the address so that my friends can see it.
Bye!!!!!!!!!
jueves, 4 de octubre de 2007
Cleopatra's Palace
Hello teacher Marsella!!!!!!
This is my report of my favorite topic: Cleopatra's Palace.
In the page of Discovery Channel I read about the program for start an article of investigation for make a web page about the Cleopatra's Palace.
This is one of the most interestig topics for my person and I know that I will go to obtain make this web page.
In this page I have to talk of the Cleopatra's life and I have to recopiled information for make my work of investigation.
Well this is my plan for can to work and y will be to send you information about my topic.
Bye teacher. Have a nice day.
P.S. I remember you: my URL is guadalupe-egipto. O.K. Bye.
This is my report of my favorite topic: Cleopatra's Palace.
In the page of Discovery Channel I read about the program for start an article of investigation for make a web page about the Cleopatra's Palace.
This is one of the most interestig topics for my person and I know that I will go to obtain make this web page.
In this page I have to talk of the Cleopatra's life and I have to recopiled information for make my work of investigation.
Well this is my plan for can to work and y will be to send you information about my topic.
Bye teacher. Have a nice day.
P.S. I remember you: my URL is guadalupe-egipto. O.K. Bye.
miércoles, 3 de octubre de 2007
Answers
QUESTIONS.
1. What is the text about?The text talk about of the interesting and wonderful world of Harry Potter. The Harry Potter books are the best in the world because the people have got on to them.
2. Do we know how many books were sold at midnight the day it was published?
No, we know how many books were sold in US: 12 million.
3. Who is Amanda Craig?
She is an author and a book critic.
4. How is "fantasy" described?
That's a type of fiction featuring imaginary worlds and magical events.
5. Which two things explain the popularity of the book?
One is that in every book JK Rowling is sort of writing a detective story or a thriller, and there’s where adults have got on to the whole series, and the other more interesting thing is she’s actually made the magical world seem real, seem something you could just walk into off Tottenham Court Road, and by doing that she’s also correspondingly made reality more magical.
6. Why JK Rowling books make wonderful films?
Because she’s probably most respected for encouraging so many millions of young people to read fiction. She’s made them interested in it; she’s ‘turned them on to’ reading. And so now, reading is ‘cooler’ – it’s much more fashionable than it was. She’s stopped reading from being ‘killed off’ by computer games and she’s ‘paved the way’, she’s prepared the way, for another great children’s writer! Try to catch his name.
7. Why is JKR more respected?
Because she encourag so many millions of young people to read fiction.
8. Who is Phillip Pullman?
He is a great children writer.
jueves, 27 de septiembre de 2007
Harry Potter and the Dethly Hallows
Amber: Hello, I’m Amber and this is bbclearningenglish.com. In Entertainment today, we listen to a review of the seventh, and last, Harry Potter book - Harry Potter and the Deathly Hallows – which millions of children (and adults) rushed out to buy at midnight on the day it was published simultaneously in 93 countries! It had a print run of 12 million in the US alone! After 10 years of twists and turns in the life of the young wizard, Harry Potter, there’s a final confrontation between Harry and a highly evil character. It’s a dark rollercoaster ride, with Harry on the run most of the time. And if the sales figures are true – this is officially the fastest selling book in history! We’ll hear from the author and book critic Amanda Craig. As soon as she got hold of her copy, she sat on the sofa reading it for ‘6 hours solid’ - she didn’t put it down until she’d finished! So what’s so magical about the Harry Potter books? Well, Amanda Craig has an interesting answer to that question. She quotes JK Rowling who has said she doesn’t really like ‘fantasy’ – that’s a type of fiction featuring imaginary worlds and magical events! (We have the related adjectives ‘fantastic’ and ‘fantastical’ – meaning - not real, strange and imaginary.) Amanda Craig says the world of Harry Potter is so ‘irresistible’ – it’s so overpowering – because of two things. She says it’s a result of – ‘it’s down to’ – two things. Try to catch what they are.Amanda Craig: ‘One of the most interesting things about her is that she’s said that she doesn’t really like fantasy. And in fact, if you look at the way that she’s written it, I think the explanation for why she’d so popular is down to two things – one is that in every book she’s sort of writing a detective story or a thriller, and there’s where adults have got on to the whole series, but the other more interesting thing is she’s actually made the magical world seem real, seem something you could just walk into off Tottenham Court Road, and by doing that she’s also correspondingly made reality more magical, and I think that’s what’s so irresistible about her vision, her … you know, Harry’s whole world that it’s a world in which wizards do have to learn magic, they have to do homework, and that’s really delightful.’Amber: So Amanda Craig explains that she thinks the magical power of the Harry Potter books is down to the exciting stories or plots – every book is like a detective story or thriller. And this is why adults like the books; this is why adults have ‘got on to’ them, why they have become interested in them. And the books make the magical seem real – as real as Tottenham Court Road - a busy road of shops and cafes in central London! And they make the real world seem magical – that is clever isn’t it?Amber: JK Rowling is also often praised for being a very cinematic writer which is why her books make wonderful films. But she’s probably most respected for encouraging so many millions of young people to read fiction. She’s made them interested in it; she’s ‘turned them on to’ reading. And so now, reading is ‘cooler’ – it’s much more fashionable than it was. She’s stopped reading from being ‘killed off’ by computer games and she’s ‘paved the way’, she’s prepared the way, for another great children’s writer! Try to catch his name.Amanda Craig: ‘I think a lot more children have been turned on to reading and reading has become a lot cooler than it was. It was real danger of just being killed off by game boxes and computers and I think – yes! – and she’s paved the way for another really great children’s writer which is Phillip Pullman, who has it all, I think!’Amber: So if you’ve enjoyed the Harry Potter books, try reading Philip Pullman’s stories. Loads of adults think they’re brilliant too! Start with ‘His Dark Materials’… Now let’s recap the language we focussed on. fantasy – a type of fiction featuring imaginary worlds and magical events to be down to something – to be the result of something irresistible – overpowering cooler – more fashionable to be killed off – to be ended paved the way – prepared the way More entertainment news stories and language explanations next time at bbclearningenglish.comANSWER THE FOLLOWING QUESTIONS.1. What is the text about?2. Do we know how many books were sold at midnight the day it was published?3. Who is Amanda Craig?4. How is "fantasy" described?5. Which two things explain the popularity of the book?6. Why JK Rowling books make wonderful films?7. Why is JKR more respected?8. Who is Phillip Pullman?
viernes, 21 de septiembre de 2007
Hello!!
My name is María Guadalupe Montes Luna and I ‘m student of the Preparatory number one "Gabino Barreda". I ‘m fifteen years old and I’m from Mexico city. I was on the Tecnic Secundary number 18 "Plan de Ayala" and I was a exellent sudent.
My father is Frank Montes and my mother is Mary Luna. My brothers are: Harry, Frank, Alfred and Mike and they are nice with me. I love to my family and don’t change them for nothing.
I read very much and like me write songs and poems. My passion is Egypt and I want to be an egiptologist. My dream is have a carrer and I want to be a proffessional.
I hate the war and the hypocrite persons. Like me the animals, on special the cats, though don’t can have it on my house because my brother Mike is allergic. I’m a person very happy and enjoy of the life.
I play the guitarra the Tuesday and the Thursday and is very good for me can to have others things for my personal superation.
I want to be on the Mediateca because I want to study more the idiom of english. I think that learn more english is a big oportunity for me and think that it help me much for my future.
I want to keep my dreams and my purposes and I will be a famous egiptologist.
My name is María Guadalupe Montes Luna and I ‘m student of the Preparatory number one "Gabino Barreda". I ‘m fifteen years old and I’m from Mexico city. I was on the Tecnic Secundary number 18 "Plan de Ayala" and I was a exellent sudent.
My father is Frank Montes and my mother is Mary Luna. My brothers are: Harry, Frank, Alfred and Mike and they are nice with me. I love to my family and don’t change them for nothing.
I read very much and like me write songs and poems. My passion is Egypt and I want to be an egiptologist. My dream is have a carrer and I want to be a proffessional.
I hate the war and the hypocrite persons. Like me the animals, on special the cats, though don’t can have it on my house because my brother Mike is allergic. I’m a person very happy and enjoy of the life.
I play the guitarra the Tuesday and the Thursday and is very good for me can to have others things for my personal superation.
I want to be on the Mediateca because I want to study more the idiom of english. I think that learn more english is a big oportunity for me and think that it help me much for my future.
I want to keep my dreams and my purposes and I will be a famous egiptologist.
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