冥王星真的被除名了... - 地球科學討論

今天的消息（New York Times）

Astronomers Decide Pluto Is Not a Planet

未來行星的定義將是

a celestial body that is in orbit around the sun, has sufficient mass for
its self-gravity to overcome rigid body forces so that it assumes a ...
nearly round shape, and has cleared the neighborhood around its orbit.

http://0rz.net/ad1LO

難過歸難過，不過科學還是要嚴謹啊...

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