Deep impact first visited comet Tempel 1 in 2005, crashing an impactor into the comet to help scan its composition from afar.

“深度冲撞”号于2005年第一次造访了彗星Tempel 1，为了分析该彗星的构成，它抛出了一个冲撞器。

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Tempel 1 is up in the sky and in the--that's actually a fairly easy thing to see, because it's near Jupiter.

NPR: NASA 'Deep Impact' Probe Targets Comet

On July 4th, the spacecraft Deep Impact will launch a projectile at Tempel 1, a comet NASA has been watching for a few years.

NPR: NASA 'Deep Impact' Probe Targets Comet

The impactor used simpler versions of the flyby spacecraft's hardware and software and sent back images of Tempel 1 up to three seconds from impact.

BBC: Q&A: Deep Impact comet mission