In pictures: Deep Impact: A mission to crash into a comet
The big show

A perfect Independence Day.

Nasa's Deep Impact mission crashed a projectile into Comet Tempel 1 more than 130 million km from Earth.

The accuracy required was so great that one mission scientist said it was like one bullet hitting another bullet with a third bullet exactly in position to see it all happen.

(Images: Nasa/JPL-Caltech/UMD)

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