Before long, the sources were identified as rotating, magnetized neutron stars. A tightly collimated beam of radiation is ejected along the neutron star's magnetic axis. We see regular pulses as it rotates, hence “pulsar."
Here, let me show you with this old tweet by @AstroKatie. (The link in the tweet points to https://www.atnf.csiro.au/outreach/education/everyone/pulsars/index.html)
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