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Hmm. Interesting questions.
"Earth" is this specific planet.
"World" is a planet, and I always think of a world as being suitable for inhabitation or visitation, though I doubt that is in any way a rigid definition.
There's also of course the metaphorical use of world to mean one's own experience of the environment or social landscape around oneself: the world of Barbelith; "her world exploded"; World Of Leather, etc. - so thus your world is the physical and metaphysical space which you inhabit.
"Globe" is more of a geometric description of the shape of the planet Earth and similar other worlds.
A planet (coming from the Latin planeta, then ultimately Greek, meaning "wanderer") is an object, not necessarily a globe or world, which orbits a sun. Various more specific definitions can be found here.
I imagine that visitors from elsewhere, assuming they have experience of other worlds, might call the Earth "that blue-green place with the somewhat primitive inhabitants", assign it a catalogue number, name it after a mythical persona, or possibly just tick it off as being "mostly harmless".
(Though I'm not sure much of the above offers much of a clear distintion, I'm afraid.) |
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