Lyman-alpha blob

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What Wikipedia says

In astronomy, a Lyman-alpha blob (LAB) is a huge concentration of a gas emitting the Lyman-alpha emission line. LABs are some of the largest known individual objects in the Universe.

Excerpt from the Wikipedia article “Lyman-alpha blob”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: NASA/CXC/A.Hobart, Public domain, via Wikimedia Commons.