What is the difference between a galaxy and a nebula? How do astronomers tell them apart?
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nebulae, nebulæ, or nebulas) is an interstellar cloud of dust, hydrogen, helium and other ionized gases. Originally, the term was used to describe any diffuse astronomical object, including galaxies beyond the Milky Way. ... Nebulae are often star-forming regions, such as in the "Pillars of Creation" in the Eagle Nebula.
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