Multiple Choice
Suppose you discover a binary star system with a 0.7 solar mass giant star and a 2 solar mass main sequence star.Why is this surprising?
A) 0.7 solar mass stars are not expected to become giants.
B) All 2 solar mass stars should have left the main sequence.
C) Giant stars are expected to destroy their companions, so the 2 solar mass star shouldn't exist.
D) The 2 solar mass star should have become a giant before the 0.7 solar mass star.
Correct Answer:
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