Supernova impostor

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What Wikipedia says

Supernova impostors are stellar explosions that appear at first to be a supernova but do not destroy their progenitor stars. As such, they are a class of extra-powerful novae. They are also known as Type V supernovae, Eta Carinae analogs, and giant eruptions of luminous blue variables (LBV).

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

Image: Kevin Heider @ LightBuckets, CC BY-SA 3.0, via Wikimedia Commons.