From an observational standpoint, what is a pulsar?
A)a star that slowly changes its brightness, getting dimmer and then brighter, with a period of anywhere from a few hours to a few weeks
B)an object that emits flashes of light several times per second (or even faster), with near perfect regularity
C)a star that changes color rapidly, from blue to red and back again
D)an object that emits random "pulses" of light, sometimes with only a fraction of a second between pulses and other times with several days between pulses

Question

Quizplus · Accepted Answer

A pulsar is an object that emits rapid, regular pulses of electromagnetic radiation, usually in the form of radio waves. This is caused by the rotation of a highly magnetized neutron star, which creates a beam of radiation that sweeps across space like a lighthouse.

From an Observational Standpoint, What Is a Pulsar