Quote:
Originally Posted by jamesqf
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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Planets orbit stars. Moons orbit planets.