What is a large cloud of dust and gas where new stars are formed called?

What is a large cloud of dust and gas where new stars are formed called?
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NEBULAEBecauseA diffuse mass of interstellar dust or gas or both, visible asluminous patches or areas of darkness depending on the way the massabsorbs or reflects incident radiation.;it is a clouds of gas anddust that form a star..........
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