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R we Talking About. Only applying To stars That will Explode.

2006-07-13 20:35:42 · 5 answers · asked by savvy s 2 in Science & Mathematics Astronomy & Space

5 answers

Most observable changes in stars take millions of years. This is true of stars that go supernova until radiation pressure from the photons generated in the core after fusion has run out of fuel drops below the level needed to prevent collapse. Then things take seconds, not millions of years. In the next few seconds, all the heavy elements in the universe, and which make life possible on Earth, are generated. The star collapses until the material is so dense that pressure from the neutrinos produced by these reactions blows it apart. Neutrinos usually interact with matter so weakly that the Earth is almost completely transparent to them. A neutrino detector registers as many neutrinos from the direction of the opposite side of the Earth as from the sky above. After the initial explosion, the supernova fades over a period of a few weeks. The crab nebula is the remains of a supernova observed 952 years ago. What you can see now is a neutron star surrounded by a nebula of gas receding from it at very high speed.

2006-07-13 21:07:09 · answer #1 · answered by zee_prime 6 · 0 0

OH MAN!..I TOLD U BEFORE THE TIME FRAME FROM FUSION TO SUPERNOVA DEPENDS ON THE MASS OF A STAR!

2006-07-14 07:25:13 · answer #2 · answered by Prakash 4 · 0 0

not very long... fusion producing iron will be the last thing happening, and the star will collapse very (VERY) soon after that stops

in terms of time frame from the cessation of fusion producing helium, i'm afraid i have no idea

2006-07-14 03:41:55 · answer #3 · answered by visionary 4 · 0 0

They tend to expand over a period of a couple hundred million years or so before they contract and go critical. It varies with the original size of the star and the heat it puts out.

2006-07-14 03:43:31 · answer #4 · answered by synchronicity915 6 · 0 0

R U Mexican too? You look mexican. I'm mexican and proud of it. Check out my profile by clicking on my face.

2006-07-14 03:40:50 · answer #5 · answered by simonsnkr5 2 · 0 0

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