NASA's defunct UARS satellite is close to making its plunge through Earth's atmosphere, although nobody knows just yet where it will land.
UARS is scheduled to de-orbit Friday, plus or minus a day, according to NASA scientists' calculations.
NASA scientist Mark Matney says UARS is most likely to de-orbit Friday morning. "Right now, UARS is actually re-entering a little faster than anticipated because solar activity has gone up, which speeds re-entry," he said.
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