This time-lapse sequence of 20 images, taken by NASA's Hubble Space Telescope, reveals the dramatic effects from a collision early July 4 between comet 9P/Tempel 1 and an 820-pound probe released by the Deep Impact spacecraft. The Deep Impact probe smacked the comet at 1:52 a.m. EDT. The collision kicked up gas and dust from the comet's surface. The image sequence follows the expanding debris for 62 minutes after the impact. The final four images show a developing fan of gas and dust, which is traveling at about 450 miles an hour (720 kilometers an hour). The fan extends about 620 miles (1,000 kilometers) from the nucleus.
Publication: July 4, 2005