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How is the meaning of the word nebula different today than it was before Hubble's discoveries?
Wiki User
∙ 10y ago
"Nebula" means "cloud" [cf. "nebulous," meaning misty or uncertain]. At one time, it was though that those fuzzy lights in the night sky were patches of glowing gas, probably satellites of our Galaxy. Better ranging techniques eventually confirmed that those were other galaxies, so far away they we couldn't discern the individual stars.
Pre-Hubble, it would have been quite acceptable to speak of the "Andromeda Nebula." Now, only something we KNOW is a gas cloud can be called a nebula, the most common usage being for "planetary nebulae" which, to add further confusion to the uninitiated, aren't composed of planets.
Wiki User
∙ 10y ago
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