This screen grab image provided by NASA shows UARS attached to the robotic arm of the space shuttle Discovery during mission STS-48 in 1991, when UARS was deployed. NASA scientists are doing their best to tell us where the plummeting 6-ton satellite will fall later this week.
It's just that if they're off a little bit, it could mean the difference between hitting Florida or New York. Or, say, Iran or India.