Keeping track of UARS' reentry
Sep. 21, 2011 | 11:40 PDT | 18:40 UTC
Unless you've been living under a rock you've probably heard that a very large Earth-orbiting satellite is going to be reentering Earth's atmosphere soon, and there's a small but nonzero chance of debris coming down where somebody might actually find it. The chance is smaller, but still nonzero, that something or someone will get hit by a piece. The odds of any one person getting hit by a piece are somewhere around 1 in 20 million million.* The actual date and location of its fall has been very uncertain because it depends upon qualities of the upper atmosphere that are themselves influenced by highly variable solar weather. As time gets shorter, predictions get a little more certain, so we now know for sure that Friday is the day. (Depending, of course, on your time zone.)
Here's a roundup of some useful facts and links that you can use to learn about and follow UARS' demise. (
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