Wikipedia - "A nebula (from Latin: 'cloud'; pl. nebulae or nebulæ, with ligature or nebulas) is an interstellar cloud of dust, hydrogen gas, helium gas and other ionized gases. ... In these regions the formations of gas, dust, and other materials "clump" together to form larger masses, which attract further matter, and eventually will become big enough to form stars. The remaining materials are then believed to form planets, and other planetary system objects."
Wikipedia, Hubble Site, YouTube - Tour of our galaxy's visible nebulae
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