Photo: NASA
Officials don't know when or where pieces of Upper Atmosphere Research Satellite fell but estimate they are at bottom of Pacific Ocean
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International group of researchers says sub-atomic particle moved faster than the speed of light
Space agency says there is a one in 3,200 chance that one of 7 billion people on the planet will be struck by the falling satellite
Experts say it is hard to determine just when or where it will reenter the atmosphere.
Bus-sized satellite UARS expected to arrive 'sometime during the afternoon' EDT, 5 continents, several oceans as possible strike zones
UARS satellite likely to reenter atmosphere on September 23, 2011; crash likely between 57 degrees north latitude, 57 degrees south
Experts say Ocean observatory will be transformative
Speed and unrealistic situations affect preschoolers
Discovery is the first time a so-called circumbinary system has been detected
New, Space Launch System or SLS to take astronauts beyond low-Earth orbit to Moon, to asteroids and, one day, to Mars
Appears to be 1.75 million years old
Alien world is one of a record bounty of 50 exoplanets reported recently by European planet-hunters
Fossils show primitive and modern traits
Artists earn income from online ads, merchandise sales
Global positioning technology tracks friends as well as directions
