Superbubble

Rarity: Common

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What Wikipedia says

In astronomy a superbubble or supershell is a cavity which is hundreds of light years across and is populated with hot (106 K) gas atoms, less dense than the surrounding interstellar medium, blown against that medium and carved out by multiple supernovae and stellar winds.

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

Image: ESO, CC BY 4.0, via Wikimedia Commons.