Markarian 231

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What Wikipedia says

Markarian 231 (UGC 8058) is a Type-1 Seyfert galaxy that was discovered in 1969 as part of a search for galaxies with strong ultraviolet radiation.

Excerpt from the Wikipedia article “Markarian 231”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: NASA, ESA, the Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration, and A. Evans (University of Virginia, Charlottesville/NRAO/Stony Brook University), Public domain, via Wikimedia Commons.