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originally posted in: Why is Mars not WHITE
1/28/2015 7:28:48 PM
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Isn't Pluto a planet again?
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  • Nope. Still fails one of the three requirement to meet planetary classification. To classify as a full planet, a body must: - Be an object which independently orbits a star (cannot be a moon of another body) - It must have enough Mass that it's own gravity pulls the body into a rough spherical shape - It must be large enough in size that it "dominates" its orbit (i.e. it must be the largest object in its orbit trajectory and therefore have enough Mass to "clear out" other bodies in its same orbit [either by absorbing then into it's own Mass, eject other bodies from its orbital trajectory, or capture other bodies as moons]). Pluto (and the other Dwarf Planets) only fulfill the first two requirements.

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  • Isn't Pluto a Moon? So does it have a solid surface?

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  • No, but Pluto does have it's own moon.

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  • Pluto isn't a moon, but it does have a solid surface, you could think of Pluto as being an oversized cluster of dirt and ice.

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