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Explanations for UFO sightings

China Daily | Updated: 2008-10-21 07:49

Here are 10 possible explanations for UFO sightings.

1) Weather balloons - Gas-filled balloons that measure conditions in the upper atmosphere to help forecasters.

2) Clouds - Saucer-shaped or "lenticular" clouds that form at high altitudes have been confused with UFOs.

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