A nebula is an interstellar cloud of dust, hydrogen, helium and other ionized gases. Originally, the term was used to describe any diffused astronomical object, including galaxies beyond the Milky Way.
Tip: You can see Orion Nebula with your naked eyes in Orion constellation, because it is one of the most brightest Nebula.
~ αтυℓ вσүℓℓα ~
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