What scientists are learning after SpaceX debris crashed into the moon
A four-ton upper stage of a SpaceX rocket is believed to have hit the moon at 5,400 mph. The SpaceX rocket launched a pair of lunar landers last year, but the company's scientists say a combination of solar activity and gravity put it on a collision course with the moon. Geoff Bennett discussed larger concerns about lunar litter with science correspondent Miles O'Brien.
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