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NASA Curiosity Rover spots iguana on Mars

Astronauts see strange cloud in space, remnant of missile launch

Photo shows 'UFO' above medieval castle

Spaced out UFO fan sparks Internet frenzy over frozen 'alien'

On 65th anniversary of Roswell ‘UFO’ crash, questions remain

One-third of Americans believe in UFOs, survey says

What do declassified 'UFO' documents say about alien life?

'Invisible UFOs' fill the skies

Are we alone? The interstellar search for alien life

Deep-sea Baltic UFO hunt turns up mere rocks