GK
BIG BANG THEORY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What two forces are balanced during a star’s main sequence?
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hydrogen and helium
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gravity and fusion
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gravity and hydrogen
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fusion and helium
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Explanation:
Detailed explanation-1: -(2) Which two forces are in balance for a main sequence star? While self-gravity pulls the star inward and tries to make it collapse, thermal pressure (heat created by fusion) pushes outward. These two forces cancel each other out in a main sequence star, thus making it stable.
Detailed explanation-2: -1 Answer. Pressure and gravity. Pressure due to fusion reactions pushes outwards. Gravity pulls inwards to keep the star in equilibrium.
Detailed explanation-3: -Gravity constantly works to try and cause the star to collapse. The star’s core, however is very hot which creates pressure within the gas. This pressure counteracts the force of gravity, putting the star into what is called hydrostatic equilibrium.
There is 1 question to complete.