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To: Shryke
Doesn't a star that goes nova do exactly that?

Well, no. Novas aren't powered by gravitational collapse, and they don't dissipate the entire star. Supernovas are powered by gravitational collapse, but they also don't dissipate the entire star, but leave a neutron star behind.

67 posted on 10/06/2004 11:06:45 AM PDT by Physicist
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To: Physicist
Supernovas are powered by gravitational collapse, but they also don't dissipate the entire star, but leave a neutron star behind.

Or a black hole depending on the stellar mass.

68 posted on 10/06/2004 11:11:19 AM PDT by RadioAstronomer
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To: Physicist

Thank you. I am, of course, still partially confused. It appears the author advances that idea that, given a gravity well where hydrogen is continually compressiing, the heat generated would produce expansive forces that outweigh the attraction of gravity. I am unsure if this threshold is below what is needed for fusion, or above it. However, even if above (hotter) than the fusion threshold, ultimately there comes a point where the heat (expansive) certainly exceeds the gravity, no? Thus, supernova? I am aware that every nova or supernova leaves behind a mass, even a singularity, but I cannot see how this situation does not agree with what this author is stating. Please try to assume I am a stupid person and explain again, if you have the time/inclination. This is fascinating to me. Now I must go pound some square blocks into round holes.


70 posted on 10/06/2004 11:36:31 AM PDT by Shryke (Never retreat. Never explain. Get it done and let them howl.)
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