superbubble

== English == === Etymology === From super- +‎ bubble. === Pronunciation === === Noun === superbubble (plural superbubbles) (astronomy) A very large region of space, relatively free of matter, carved out of the interstellar medium by the combination of multiple supernova bubbles resulting from supernovae. ==== Synonyms ==== (astronomy): supershell ==== Translations ==== ==== See also ==== (space plasmas):