Deep Impact on Comet Tempel 1 from Hubble . ... Credit Copyright: P. Feldman ( JHU ) H. Weaver ( APL ), ESA , NASA Explanation: It was a human-made event visible across the Solar System. At the direction of terrestrial scientists , a refrigerator-sized probe from the Deep Impact mission struck Comet Tempel 1 on July 4 at over 35,000 kilometers per hour. ... The area encompassing the comet became over three times brighter in the hours after the impact. ... NASA Official: Jay Norris. ...