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Nebula

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Nebulae, the quintessential cosmic plasma

A nebula (Latin: "mist"; pl. nebulae or nebulæ, with ligature; from Greek nephele, "cloud") is an interstellar cloud of dust, gas and plasma. Originally nebula was a general name for any extended astronomical object, including galaxies beyond the Milky Way (some examples of the older usage survive; for example, the Andromeda Galaxy is sometimes referred to as the Andromeda Nebula).

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