Supernovae are ____.
A) very common: there are thousands of detectable events occurring in our galaxy each year
B) common: a few dozen are detected in our galaxy each year
C) uncommon: there are only one or two detected in our galaxy each year
D) rare: only one or two occur each century in our galaxy
E) extremely rare: only one or two are detected in the Universe each decade
Correct Answer:
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Q52: Supernovae are the main source of _
Q53: A white dwarf that exceeds the Chandresekhar
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