10 years ago today, NASA's Deep Impact probe slammed into Comet Tempel 1. What we have learned since then.
On July 4, 2005, NASA's Deep Impact spacecraft released an 820-lb. (370 kilograms) probe that smashed into Comet Tempel 1 at 23,000 mph (37,000 km/h), gouging out a crater about 500 feet (150 meters) wide.
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