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In Nebulla Very energetic ultraviolet light from hot star excites a cloud of Hydrogen gas , UV radiation ionises the Hydrogen gas . The free electrons combine with protons forming Hydrogen and Red gas .

In this way Nebula emits light .

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What are the similarities between a Nebula and a Supernova?

Not much other than that they both emit light in large quantities.A nebula is a grouping of billions of stars, while a supernova is a single star exploding at a stage in its development.Comments: That meaning of "nebula" as a galaxy (or a star cluster within a galaxy) is a bit out of date now. Nowadays a nebula usually means a cloud of gas and dust. It doesn't usually emit much light.Actually there is a connection between a supernova and a nebula.Some of the stuff found in nebulae comes from supernova explosions.


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