Experts say Friday remains the most likely day that the NASA research satellite will come crashing down through the atmosphere. An estimated 26 pieces - representing 1,200 pounds - are expected to survive.
NASA is anticipating a splashdown rather than a landing. Nearly three-quarters of the world is covered with water. The Aerospace Corporation in California, in fact, predicts that re-entry will occur over the Pacific late Friday afternoon, Eastern Time. But that's give or take 14 hours.
The 20-year-old Upper Research Atmosphere Satellite will be the biggest NASA spacecraft to fall uncontrolled from the sky in 32 years.
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UARS satellite: http://www.nasa.gov/mission-pages/uars/uars-concept.html
