X-ray pulsar

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What Wikipedia says

X-ray pulsars or accretion-powered pulsars are a class of astronomical objects that are X-ray sources displaying strict periodic variations in X-ray intensity. The X-ray periods range from as little as a fraction of a second to as much as several minutes.

Excerpt from the Wikipedia article “X-ray pulsar”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Dana Berry/NASA Goddard Space Flight Center, Public domain, via Wikimedia Commons.