Why Is Supernova 1987A Particularly Important to Astronomers

Multiple Choice

Why is Supernova 1987A particularly important to astronomers?

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