A fragment from the same family of asteroids is thought to have wiped out the dinosaurs 65 million years ago.

据认为，同一小行星家族的一个碎片曾经在六千五百万年前灭绝了恐龙。

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If he could find a sample and identify its class, he would be able to make new conclusions about the thousands of other asteroids in the same family.

如果能找到一块样本就可以确认其分类，得出数以万计同一家族其他小行星的结论。

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Critically, the Baptistina family of asteroids - those that were formed when the larger asteroid destructively entered the main belt - were only formed around 80 million years ago.

BBC: Asteroid thought to kill dinosaurs may not be guilty

The results suggest the meteor belongs to a well known family of space rocks - known as the Apollo asteroids - that cross Earth's orbit.

BBC: Russia meteor's origin tracked down