Friday, September 23, 2011

What happens to a star after it explodes?

If a star explodes (a star can explode, right?), then after a long period of time, the light seizes to shine, correct? What happens to a star after it explodes?|||.|||it becomes a black hole|||Since stars are made up of mostly hydrogen which is fused into helium, when it explodes (which it does), all the hydrogen, helium and other heavier elements get blown into space. Have you seen some of the 'dust clouds' pictures from teh hubble? well, that's stuff from other stars blowing up. over time (in theory) all that blown out star stuff will group back together and perhaps make another star...|||Proper motions of 24 stars and sur le mouvements des grands meteors|||The final phase of a stars life depends on it's size and mass. Average stars like our sun will go nova and collapse into a brown dwarf emitting a feeble light. A medium star will go nova and collapse into a dense neutron star or pulsar with very strong gravity and rotate at a very high rate and emit x-ray pulses. A massive star will go nova and collapse into a very small mass with tremendous gravity that is so great that nothing can escape, not even light. This is called a black hole.|||stars don`t explode they implode|||After a star explodes it becomes a "dwarf".It means a huge mass in a small volume. A dwarf, subject to certain conditions(like "Chandrasekhar limit") may become a black hole-a hole in the space having infinite density which prevents light from being emitted from it.|||Black hole, or empty space.|||They can blow up completely.


They can condense into black holes which decays after time.


They can condense into a smaller star and decay over time.|||The result can be: a neutron star, a black hole, or it will stay a white dwarf (for a 'while', while generating succeeding explosions, until it's out of (gaining enough) energy for a new explosion).





A star explosion, could be a nova, supernova or hypernova.





Wikipedia, supernova:


There are several different types of supernovae and two possible routes to their formation. A massive star may cease to generate fusion energy from fusing the nuclei of atoms in its core, and collapse under the force of its own gravity to form a neutron star or black hole. Alternatively, a white dwarf star may accumulate material from a companion star until it nears its Chandrasekhar limit and undergoes runaway nuclear fusion in its interior, completely disrupting it. Note that this second type of supernova should not be confused with a surface thermonuclear explosion on a white dwarf, which is called a nova.





Wikipedia, nova:


If a white dwarf has a close companion star that overflows its Roche lobe, the white dwarf will steadily accrete gas from the star's outer atmosphere. The companion may be a main sequence star, or one that is aging and expanding into a red giant. The captured gases consist primarily of hydrogen and helium, the two principal constituents of ordinary matter in the universe. The gases are compacted on the white dwarf's surface by its intense gravity, compressed and heated to very high temperatures as additional material is drawn in. The white dwarf consists of degenerate matter, and so is largely unresponsive to heat, while the accreted hydrogen is not. Hydrogen fusion can occur in a stable manner on the surface through the CNO cycle, but the dependence of the helium fusion rate on temperature and pressure mean that it is only when helium is compressed and heated near the surface of the white dwarf to a temperature of some 20 million K that a nuclear fusion reaction rapidly converts a large amount of the helium into other heavier elements.[1] The enormous amount of energy liberated by this process blows the remaining gases away from the white dwarf's surface and produces an extremely bright outburst of light. The rise to peak brightness can be very rapid or gradual which is related to the speed class of the nova ; after the peak the brightness declines steadily.|||it becomes a black hole and after it will split up into particals called photons

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