Well, I think a general definition would be that a space explosion is a "rapid" and/or large release of energy -ultimately gravitational potential energy. There are several mechanisms that can cause explosions. One recent one that was in the press
( explosion.bubbles ), was an observation of an "explosion" due to a lot of matter falling into a super massive black hole at the center of a galaxy. As the matter falls into the black hole it releases energy which drives the
explosion, somewhat similar to a big meteor
falling onto/crashing into the Earth which I guess
would be another type of space explosion.
Supernovae are also a type of explosion where the core of a star collapses under its own weight and explodes. Can you think of any other types of "space explosions?"
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