PHYS 190 Chapter Notes - Chapter 12: Supernova, Small Solar System Body, Gravitational Collapse

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We are made of very old matter. Although particles formed quickly, not linked together to form atoms common today. Most of matter was hydrogen, about 25% was helium. Very few of heavier atoms made in big bang. Generations of stars cooked original particles, fusing them into atoms such as carbon, nitrogen, oxygen. Most of iron in body was produced by carbon fusion in type ia supernovae & by decay of radioactive atoms in expanding matter ejected by type ii supernovae. Elements uncommon enough to be expensive were produced during violent deaths of rare massive stars. Collisions b/w particles in rotating cloud tend to flatten cloud into disk shape. According to solar nebula theory, earth & other planets formed billions of years ago as. Theory predicts that most stars should have planets b/c planet formation is natural part of star formation & therefore planets should be very common in universe, probably more common than stars.

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