The alien invasion has been called off - for now.
A mysterious light seen in Southwestern skies was not a UFO, but most likely a fragment of an asteroid entering the Earth's atmosphere, a NASA scientist said.
Residents from Phoenix to Las Vegas and along Southern California's coast reported a strange bluish-green light streaking through the sky Wednesday evening.
Many videotaped the object and flooded local authorities and newsrooms with calls.
"I saw something that looked like a falling star, but it must have been a fireball in the atmosphere," one witness told NBCLA. "It was huge. It had a green glow in front of it and a white tail. It looked like green fireworks going across the sky."
Experts say it was very likely a piece of space rock burning up as it entered the Earth's atmosphere.
"We can't say 100%," said Don Yeomans, manager of NASA's Near-Earth Object Program, "but it's almost certain that the object was a fireball" or very bright meteor, "the size of a basketball or baseball that likely disintegrated before it hit the ground."
Yeomans said the bluish-green color suggests the object contained magnesium or nickel. The orange color was an indicator that it entered Earth's atmosphere at several miles per second - a moderate rate of speed.
"They make an impressive show for such a small object," he said.
While this kind of fireball event is much rarer than shooting stars, Yeomans said they happen on a weekly basis somewhere on Earth, usually over the ocean.
"It's a natural phenomenon and nothing to be concerned about," Yeomans said.
Federal Aviation Administration spokesman Ian Gregor said that there were no aircraft incidents reported in the region.
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