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A new video taken from a late-night flight appears to show a UFO outside the window. Or not.

Strangely-shaped skulls found in Mexico suggest to some that aliens have visited -- and mated with -- humans. Others aren't so sure.

The government has announced that a "mystery missile" was in fact a jet contrail. But what does the evidence show?

In January, a UFO videotaped over Jerusalem made news worldwide. Early skeptical analysis branded it a hoax, but was it?

Is a new viral video of an alien body recovered in Russia for real?

Does a 1950 FBI document prove that the Roswell UFO crash was real?

Turns out thinner people eat more chocolate, another "UFO" has been found and a "ghost ship" is floating off Canada's west coast!