Question

What are supernovae?

A. stars that have reached the end of their lifetimes because their nuclear fuel is exhausted
B. stars that suddenly brighten by 100 to 10,000 times in a day
с. stars that have just been born
D. galaxles that have binary systems

Answer 1

A. Stars that have reached the end of their lifetimes because their nuclear fuel

Step-by-step explanation:

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Answer 2

A

Step-by-step explanation:

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