When a star's core fusion dies out from lack of fuel, the star sucks into itself until the force of it causes it to implode. This is a supernova. Sometimes, when a supernova occurs, the gases of the stars will be energized and propelled out into space, leaving charged gases in the place where the star used to be. This is a supernova remnant, a special type of diffuse nebula.
The Crab Nebula, seen above, is a popular supernova remnant. It even looks like part of an explosion frozen in time and space. Some of the light from these nebulae comes from ionized gas and x-rays, like the nebulae we discussed previously. This one does have a distinct distinguish-er though: most of its light is created by radiation from the old star's core.
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