NASA investigates what could have made a Stonehenge-like structure on Mars.
President Kennedy demanded that the CIA share their UFO data with NASA.
The Curiosity Rover finds a strange, and perhaps sinister, object on Mars.
Two suns photographed in the sky may be a sighting of our sun's evil twin.
Scientists examine strange octopus DNA to see if it could be alien.
The CIA plans revenge when the Soviet Union unveils its own space shuttle.
The last humans on the Moon discover something strange on the surface.
A mysterious object orbiting Saturn looks just like the Death Star.