Rest easy, North Americans. You will not be hit by falling space debris Friday. NASA refined its prediction for the falling Upper Atmosphere Research Satellite, saying it will probably reenter the atmosphere some time Friday afternoon, Eastern Daylight Time, and will not fall in North America. Other than that, NASA said it was still too early to make predictions. The pieces that remain after re-entry—an antenna gimbal, fuel tanks, batteries, and wheel rims—will be strewn across a 500 mile area. The chance that someone would be hit by a piece is 1 in 3,200. UARS was deployed in 1991.