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12/18/2014 3:59:34 PM
46
why is Pluto not a planet?
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1 回复The only reason Pluto was called a planet is because it was the first type of that object we ever found. But for centuries we didn't actually have a scientific definition of a planet. So they made a definition with multiple requirements. This search for a definition meant one of two things. Either: A. Pluto would be a planet, but so would dozens to hundreds of other 'planets' exactly like Pluto (and many larger) in our Solar System, or B. Pluto is not a planet. The latter was chosen. So we can either have 8 planets, or hundreds. Pluto is not a planet because it did not meet the criteria of being large enough to have a gravitational pull sufficient to clear away its orbit.
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3 回复I think because it's a moon that drifted away. But i'm not sure lol just sounds cool to me.
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2 回复IF PLUTO IS TOO SMALL TO BE A PLANET THEN JUPITER IS TOO BIG TO BE A PLANET. #BringBackPluto2015
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1 回复To everyone saying it's too small: Thanks for explaining in more detail. To OP: After seeing more objects about the same size as Pluto farther out in the Kuiper Belt (think Asteroid Belt but at the edge of the solar system) they looked at their definition of planet and realized that it was incorrect and needed to be redefined because there were potentially hundreds or thousands of so called "planets" in the Kuiper Belt.
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