Superbubble
Cavity hundreds of light years across created by strong stellar winds in a galaxy / From Wikipedia, the free encyclopedia
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For other uses, see Super bubble (disambiguation).
"supershell" redirects here. For other uses, see Super shell (disambiguation).
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. The winds, passage and gravity of newly born stars strip superbubbles of any other dust or gas.[2] The Solar System lies near the center of an old superbubble, known as the Local Bubble, whose boundaries can be traced by a sudden rise in dust extinction of exterior stars at distances greater than a few hundred light years.[citation needed]