Why Is Supernova 1987A Particularly Important to Astronomers

Why is Supernova 1987A particularly important to astronomers?

A) It occurred only a few dozen light-years from Earth.
B) It provided the first observational evidence that supernovae actually occur.
C) It provided the first evidence that neutron stars exist.
D) It was the first supernova detected in nearly 400 years.
E) It was the nearest supernova detected in nearly 400 years.

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