Ultraluminous X-ray source

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In astronomy and astrophysics, an ultraluminous X-ray source (ULX) is less luminous than an active galactic nucleus but more consistently luminous than any known stellar process (over 1039 erg/s, or 1032 watts), assuming that it radiates isotropically (the same in all directions).

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

Image: NASA, Public domain, via Wikimedia Commons.