The contraction of a star (or other object) due to its own gravity generates heat. If this process, known as the Kelvin-Helmholtz contraction, were to be the source of heat energy from the Sun, then the Sun's age:
A) would be about 10,000 years.
B) would be about 1 billion years.
C) would be about 25 million years.
D) could easily be its present age of 4.5 billion years.
Correct Answer:
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