The helix nebula is more close than the ring nebula, as well as
much brighter and larger than the ring but with low surface
brightness.
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The Ring Nebula is classified as a planetary nebula which is a shell of gas and plasma, formed when certain stars die.
So, in a way they are clouds of matter in space.
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lyra
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lyra
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A cloud in outer space consisting of gas or dust and planetry
nebula is one of the types also called ring nebula or A planetary
nebula is an emission nebula consisting of a glowing shell of
gas