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Old 09-20-2018, 03:38 PM   #24 (permalink)
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Originally Posted by Xist View Post
These are celestial bodies. Is Sol the same class as the rest? No. Is Luna? No. Also, does anyone argue that a moon is a planet?
Why should the moon not be considered to be the same as a planet in most practical ways? It's big enough to be round, is internally differentiated, has a bit of geology going on...

If not Luna, how about Titan? It's got an atmosphere, with oceans (or at least big lakes) & rivers, which is more than Mercury & Mars have.
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