Ultra diffuse galaxy

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What Wikipedia says

An ultra diffuse galaxy (UDG), or dark galaxy, is an extremely low luminosity galaxy, the first example of which was discovered in the nearby Virgo Cluster by Allan Sandage and Bruno Binggeli in 1984. These galaxies have been studied for many years prior to their renaming in 2015.

Excerpt from the Wikipedia article “Ultra diffuse galaxy”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: NASA, Public domain, via Wikimedia Commons.