Satellite Will Fall but No One Knows When

http://www.nytimes.com/2013/11/07/science/space/satellite-will-fall-to-earth-but-no-ones-sure-where.html?ref=science&_r=0

A European satellite that mapped Earth’s gravitational field in exquisite detail will be pulled down by gravity to its fiery destruction sometime in the next few days. Where and when it will crash no one knows. It could be almost anywhere on the globe. About 25 to 45 fragments of the one-ton spacecraft are expected to survive all the way to the surface, with the largest perhaps weighing 200 pounds. GOCE (pronounced GO-chay) ran out of propellant last month and has been dropping about 2.5 miles a day. As of Wednesday, it was still 113 miles up as it circled the Earth once every 88 minutes. Its orbit goes almost directly over the poles, and as the planet rotates, almost all places on Earth pass beneath it at some point. The chances that a chunk of GOCE or any other space debris will injure anyone are tiny, but not zero. Dr. Floberghagen said the debris will endanger about 15 to 20 square yards of the Earth’s surface.