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No. Pluto was reclassified as a "dwarf planet" because it's a tiny ball of ice and rock significantly smaller than the Moon, gravitationally bound to Neptune, and it really makes no sense to lump it in with bodies like Jupiter and Saturn.

It's really a historical accident that Pluto was ever considered a planet in the first place. People were looking for a planet to explain certain things about Neptune's orbit... it didn't seem to be moving quite right, but a planet outside Neptune's orbit about the mass of Earth would have made the calculations come out right. By sheer luck (good or bad, depending on your opinion), Pluto happened to be about where people were looking for this "Planet X".

The more we found out about Pluto, the more it didn't seem to fit the equations. Measurements of its size and mass kept coming up short, and estimations changed from "about the size of Earth" to "about the size of Mars" to "about the size of Mercury" to "maybe around the size of the Moon" to "dang, this thing is tiny."

Meanwhile, more careful measurements of Neptune's orbit showed that it didn't need any extra mass out there after all, it was orbiting precisely as predicted by theory.

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13y ago

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