From Billy Booth,
Your Guide to UFOs / Aliens.
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Are some UFOs extraterrestrial spacecraft?

A. To assert that a UFO is from another planet is a difficult task, to say the least. First, you must rule out any and all conventional objects that the UFO might be. If you are examining a UFO from a photograph or video, then you must also rule out any type of photographic anomaly, such as lens flare, light reflection, an object on the lens, or camera malfunction.

Also, UFOs can be faked, or created by camera trickery, or on a graphics program. When all of the former possibilities are ruled out, you might make the assertion that a UFO is an extraterrestrial spacecraft, but there is no way to prove this conclusively. Some people believe that UFOs are of extraterrestrial origin, but no one has proven this yet.