Transition between two images taken seven hours apart, a preview of the fireworks that may come July 4, when a probe from the Deep Impact spacecraft slams into the comet and may blast off a plume of dust material. The first image was taken June 14, 2005 at 2:17 am EDT and the second image was taken at 9:15 am EDT the same day.
Credit: NASA, ESA, P. Feldman (Johns Hopkins University), H. Weaver (Johns Hopkins University Applied Physics Laboratory), and L. Barranger (STScI)