Some UFOs may be explained as ball lighting
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(PhysOrg.com) -- An Australian scientist studying photographs of fireballs, UFO sightings and a report of a strange green light in the sky suggests some UFOs may be ball lightning caused by fireball meteors.
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Mysterious lights hover over Las Vegas sky
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What are those glowing orbs that dart across the sky the world
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UFO sighting: Several onlookers get spooked on spotting bright
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Lights in night sky over southwestern Ontario explained
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Top 6 States With The Most Alien Encounters
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At the 'UFO capital of Kansas,' a celebration of the weird and
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History's Most Infamous UFO Sightings of the Modern Era
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UNBELIEVABLE, but claimed to be REAL: Here are some popular and
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NASA's UFO Study Isn't Really Looking for Space Aliens
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UFO Sightings Pose Danger to Aviation
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Brazil and UFOs: a hotbed for the unexplained
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How the Pentagon Started Taking U.F.O.s Seriously