GK
BIG BANG THEORY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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increases
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decreases
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stays the same
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does not change
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Detailed explanation-1: -As stars age, the concentration of hydrogen in the core decreases, which lowers the power output, causing an imbalance between outward radiation pressure and inward gravitational pressure.
Detailed explanation-2: -Fusion reactions in the core gradually convert hydrogen into helium. At some point, the core becomes so depleted in hydrogen that fusion reactions at the very center cease. The result is an inert core of helium, surrounded by hydrogen-rich material.
Detailed explanation-3: -A smaller star, like the Sun, will gradually cool down and stop glowing. During these changes it will go through the planetary nebula phase, and white dwarf phase. After many thousands of millions of years it will stop glowing and become a black dwarf. A massive star experiences a much more energetic and violent end.