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The Sun has existed for a very long time without change in its appearance or behavior. This means ...

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The Sun has existed for a very long time without change in its appearance or behavior. This means ...

The Sun has existed for a very long time without change in its appearance or behavior. This means that it must be in hydrostatic equilibrium. Under these conditions, which two parameters must be in balance at all points throughout the Sun's interior?
A)   The magnetic field and the force of gravity
B)   The force of gravity and outward gas pressure
C)   The numbers of hydrogen and helium nuclei
D)   Hydrogen gas pressure and helium gas pressure

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Discovering the Universe

Edition: 7^th

Authors: Kaufmann, Comins

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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein

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