Astronomy 07/Int

D) are real sightings of alien craft. E) are psychic phenomena. 90. The 10% of UFO sightings that cannot be explained by natural phenomena. A) are simply that—sightings that are mysteries because they suffer from a lack of hard evidence (but might indeed by alien craft) B) are secret government plots. C) are hoaxes. D) are therefore sightings ... ................
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