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The sun uses the _______ cycle to create most of its energy.

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The sun is expected to live about ____ years.


A) 10 million
B) 10 trillion
C) 10 billion
D) 10 thousand

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Very massive stars live relatively short lives.

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The Earth's history shows temperature has remained stable due to constant increases in greenhouses gases.

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False

The stars with the shortest main sequence lifetimes will be


A) stars like the Sun.
B) the lowest mass stars.
C) the highest mass stars.
D) the coolest stars.

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C

Stars with less than about 0.4 times the mass of the Sun are probably


A) fully functional.
B) fully convective.
C) fully radiative.
D) convective only in the core.

Correct Answer

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Stars with a core temperature in excess of 20 million K probably have this hydrogen fusion type:


A) proton-proton
B) helium
C) iron
D) CNO

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The balance between gravity and outward radiation pressure is called ______.

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hydrostatic equilibrium

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