The Life Cycle of Stars

Descrição

the life cycle of stars in a nut shell
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FlashCards por 12ha2609, atualizado more than 1 year ago
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Criado por 12ha2609 mais de 9 anos atrás
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Resumo de Recurso

Questão Responda
1 Nebula - a cloud of gas that forms a star.
2 Protostar - a cloud of gas becomes so compressed that the heat makes it glow. It then forms a protostar.
3 Main sequence - hydrogen nuclei get close enough to undergo nuclear fusion. Star can now stay stable for billions of years.
4a- Massive stars Red supergiants - stars run out of hydrogen. Outward pressure doesn't balance gravitational pull. The stars core collapses, outer layers expand.
5a- Massive stars Supernova - at the end of the red supergiant's life they collapse rapidly and then explode. Outer layers of gas are thrown off while the core continues to collapse.
6aa- most massive stars Black holes - gravity pulls the cores of massive stars together to form black holes. Black holes are so dense that light can't even escape them.
6ab- massive stars Neutron star - if remains are not dense enough to form black holes, a small, very dense, neutron star is formed.
4b Red giants- - stars run out of hydrogen. Outward pressure does balance gravitational pull. The stars core collapses, outer layers expand.
5b White dwarf- when the core collapses it forms a white dwarf. No more fusion can take place, the star gradually cools over billions of years.

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