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This undated artist rendering released by NASA shows the Deep Impact spacecraft. In 2005, it smashed a comet with a projectile to give scientists a peek of the interior. The spacecraft went on to rendezvous with two more comets. On Friday, Sept. 20, 2013, the space agency declared an end to the mission after failing to regain contact with the spacecraft. (AP Photo/NASA)

This undated artist rendering released by NASA shows the Deep Impact spacecraft. In 2005, it smashed a comet with a projectile to give scientists a peek of the interior. The spacecraft went on to rendezvous with two more comets. On Friday, Sept. 20, 2013, the space agency declared an end to the mission after failing to regain contact with the spacecraft. (AP Photo/NASA)

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