FU Orionis

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What Wikipedia says

FU Orionis is a variable and binary star system in the constellation of Orion, that in 1937 rose in apparent visual magnitude from 16.5 to 9.6, and has since been around magnitude 9.

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

Image: NASA-JPL, Caltech, CC BY 4.0, via Wikimedia Commons.