The spacecraft for NASA's Deep Impact mission are now perched atop the Delta II rocket that will launch them on their 6-month journey to encounter a speeding comet. Preparations for the launch, ...

NASA has placed a copper probe in the path of the comet called Tempel 1. Scientists await a collision that could produce a crater in the comet the size of a football stadium. But first, they have to ...

Here come the X-rays, on cue. Scientists studying the Deep Impact collision using NASA's Swift satellite report that comet Tempel 1 is getting brighter and brighter in X-ray light with each passing ...

PASADENA, California --It sounded like science fiction -- NASA scientists used a space probe to chase down a speeding comet 83 million miles away and slammed it into the frozen ball of dirty ice and ...