The Sky at Night — Episode 8: Fallout From Deep Impact

You are watching the episode Fallout From Deep Impact On 4 July NASA hopes to send an impactor into the comet 9P/Tempel-1. Patrick Moore talks to the world's leading comet experts about the fallout from this destructive act. Chris Lintott reports from Palomar Observatory in California, where astronomers will be eagerly watching the comet to see what happens when Deep Impact hits its mark.