GK
BIG BANG THEORY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What causes stars to exit the main sequence?
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when they get too old
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when gravity causes the core to collapse
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when the star begins to exhaust all of its hydrogen and run out of fuel
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when the star begins to burn too hot and go into supernova
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Explanation:
Detailed explanation-1: -If the star is large enough, it can go through a series of less-efficient nuclear reactions to produce internal heat. However, eventually these reactions will no longer generate sufficient heat to support the star agains its own gravity and the star will collapse.
Detailed explanation-2: -When a main-sequence star exhausts its fuel, the core drops its pressure, is compressed by gravity, and heats up. The increasing temperature of the core eventually ignites hydrogen gas just outside the core in a region called the shell source.
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