NASA scientist: Mystery light over Valley likely a fireball - CBS 5 - KPHO

NASA scientist: Mystery light over Valley likely a fireball - CBS 5 - KPHO: "UPDATE: A NASA scientist says he's convinced that a brilliant light seen darting across the Southwest night sky was most likely a piece of asteroid that entered Earth's atmosphere.

Scores of people from Southern California to Arizona saw the light hurtle quickly from west to east at around 7:45 Wednesday night.

NASA Near-Earth Object Program manager Don Yeomans said he was convinced it was a fireball -- a fragment of an asteroid the size of a baseball or basketball that hit the atmosphere and disintegrated before reaching the ground.

He says it's unusual for an object of that size to be seen over populated areas.

Yeomans ruled out a dead spacecraft falling back to Earth because such events can be predicted ahead of time."

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