The investigators also put a 70-percent probability that a four-km Baptistina asteroid hit the Moon some around 108 million years ago forming the 85-km crater Tycho.

"We are in the tail end of this shower now. Our simulations suggest that about 20 percent of the present-day near-Earth asteroid population can be traced back to the Baptistina family" - William Bottke, Southwest Research Institute, Colorado, US.

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