Orion Nebula

Orion Nebula

noun Astronomy.
a luminous nebula in the constellation Orion, in the center of Orion's sword.
Also called Great Nebula of Orion.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Orion Nebula is always a great word to know.
So is big bang theory. Does it mean:
a cloud of interstellar gas and dust that appears hazy, or fuzzy, and extended in a telescope view
a theory that deduces a cataclysmic birth of the universe from the observed expansion of the universe, cosmic background radiation, abundance of the elements, and the laws of physics
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