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Nebula Science Astronomy Galaxy Universe Space Souvenir Sheet Mint NH Formula 1 stamps Flora Flowers Protea Cynaroides MiniGuinea Nebula Science Astronomy Galaxy Universe Space Souvenir Sheet Mint NH A nebula (Latin for "cloud" or "fog"; pl. nebulae, nebul, or nebulas) is an interstellar cloud of dust, hydrogen, helium and other ionized gases. Originally, nebula was a name for any diffuse astronomical object, including galaxies beyond the Milky Way. The Andromeda Galaxy, for instance, was once referred to as the Andromeda Nebula (and spiral galaxies in general as "spiral