The young Sun had a core containing less helium and more hydrogen than it has now. Which of these was NOT true of the young Sun, compared with the present Sun?
A) The young Sun was less massive than the Sun is at present.
B) The young Sun was cooler in its core than the Sun is at present.
C) The young Sun was less luminous than the Sun is at present.
D) The young Sun had a smaller radius than the Sun does at present.
Correct Answer:
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