The rocket will crash into the crater at 5,600 mph, creating a new crater - perhaps as large as 5 miles wide. The crash is scheduled to occur Oct. 9.
Scientists on Earth expect the impact to blast out a huge cloud of dust, gas and vaporized water ice at least 6 miles high. The cloud will be clearly visible to astronomers at Earth-bound observatories and the Hubble Space Telescope's new planetary camera, allowing each to observe and collect data on its composition.
I can understand that they're looking for water, and the reason why, but to bomb it, then have whatever is left to crash onto the surface seems unneccessary. Couldn't they have just sent something like they sent to Mars to test for water, rather than bomb the place?