The idea has been suggested before, but now Binzel and his colleagues have finally found observational evidence that it's happening.

这种想法以前就有人提出过，但现在宾采尔和他的同事最终找到了观测证据。

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Today Astronomer Richard Binzel stood at the podium and read the final proposal so it could be voted on.

NPR: Pluto, the Un-Planet?

The chance of a class 10 impact in the next century ranges from one in 1, 000 to one in 10, 000, Binzel said.

CNN: Scientists reduce odds of Earth-asteroid collision

Mr. RICHARD BINZEL (Astronomer): The word planet is strictly defined to be a body rounded by self-gravity, which has cleared its orbital zone.

NPR: Pluto, the Un-Planet?