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Episode 5: Celestial fireworks on July 4th!

Play Oct 13•4:08

NASA's Deep Impact mission has given us our closest look at a comet nucleus, and achieved our first contact with one. The Deep Impact spacecraft ejected a robotic probe that collided with Comet Tempel 1 on July 4, 2005, causing a huge explosion. The impact smashed free a cloud of material that the nearby spacecraft observed. Scientists are now analyzing the data to determine the makeup...

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