NebulaeA Nebulae is the plural form of 'Nebula' which is a cloud of basically dust and gas in the vast "emptiness" of the universe. Nebula are actually nicknames for any diffuse astronomical object
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GalaxiesAs well as Nebulae, it's the plural form for 'Galaxy'. a galaxy is a gravitational system that contains stars, stellar remnants, interstellar gas, dust, and dark matter
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