The stars Procyon and Betelgeuse both appear equally bright to Earthbound viewers. Yet Betelgeuse emits 5000 times more light than Procyon. Why do they appear to be equally bright?
A. because Betelgeuse is much farther than Procyon
B. because Procyon is superhot
C. because Betelgeuse lies in the same plane of Earth's orbit
D. because Betelgeuse is undergoing fission, not fusion
Answer: A
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