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Explanations for UFO sightings
16/05/2008 12:59 - (SA)
London - Here are 10 possible explanations for UFO sightings:
Weather balloons - Gas-filled balloons that measure conditions in the upper atmosphere to help forecasters.
Clouds - Saucer-shaped clouds that form at high altitudes have been confused with UFOs.
Meteors - Space debris can create a spectacular lightshow when it burns through the Earth's atmosphere.
Civilian or military aircraft - Planes can look mysterious at night or in certain light conditions.
Ball or bead lightning - Strange forms of lightning that are rarely seen and are the subject of scientific debate.
Stars or planets - Heavenly bodies can be confused with UFOs.
Sundogs - Also called "mock suns", these are bright spots on the solar halo that appear as balls of light in the sky.
Airships or advertising balloons - These can look like flying saucers from some angles, especially at night.
Mirages - A natural phenomenon where cold or hot air bends light rays to produce an image of a distant object in the sky.
Magnetic fields - A Ministry of Defence report said people exposed to certain electrical or magnetic fields can suffer from "vivid, but mainly incorrect" recurring memories.
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