... asteroid 小行星 asteroid number 小行星号 astronomical unit (AU) 天文单位 ...
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However the practicalities of landing a spacecraft to monitor, explore or deflect an asteroid still face a number of challenges.
CNN: Space's threat to civilization
The large number and concentration of craters point to an old asteroid.
BBC: Eros is 'no ordinary rock'
They are then given a catalogue number (Bagehot's shows that it was the 2, 901st asteroid to be identified formally).
ECONOMIST: Today we have naming of parts
asteroid number 小行星号 每一颗已知的小行星都有一个编号。这没有什么特殊意义，只是第N+1颗星在第N颗星后被发现。
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