"Pulsar" can refer to different things depending on the context. Here are a few of the most common meanings: 1. **Astrophysics**: In astronomy, a pulsar is a highly magnetized, rotating neutron star that emits beams of electromagnetic radiation out of its magnetic poles. These beams are usually observed in the radio frequency spectrum but can also include X-rays and gamma rays.
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This is one of those things that when astronomers first saw them they went "oh fuck we've found extraterrestrial life".