Discussion
In the universe, what are pulsars?
Answer: B
Pulsars are rotating neutron stars.
A neutron star is the extremely dense core left when a massive star explodes as a supernova. Pulsars are neutron stars that spin rapidly, up to hundreds of times a second, and emit beams of radiation from their magnetic poles. As a beam sweeps past the Earth, it is detected as regular pulses, like a lighthouse.
A pulsar is a single object, not a group of stars. The explosion that creates it is a supernova, and the radio waves are what we detect from a pulsar, not the pulsar itself.
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