We're taking a big piece of metal and impacting the moon to kick up a big bunch of debris. Then we're going to fly through the debris and see if there's ice in it."

- JENNIFER HELDMAN, NASA scientist, explaining a mission the space agency plans for late 2008 in which it will crash a probe at 5,600 miles per hour into the moon, then use a separate craft to test the composition of the moon dust kicked up by the impact