UARS Re-Entry

NASA is refining where pieces of its huge UARS satellite will return to Earth, but it still can't pinpoint the exact location. The when, however, seems to be sometime Friday afternoon, EDT. In that case, North America would be outside the possible impact zone.

NASA computer models predict perhaps 26 chunks of the satellite will actually reach the surface, and the odds are good most if not all of those will hit water. The space agency doesn't think it will be able to predict with precision where the pieces will hit until about two hours before impact.