USA: Are these grainy photographs proof of mysterious, hidden alien structures on Mars? Probably not, but it has not stopped self-proclaimed alien and UFO 'experts' from claiming a series of images ...

USA: Are these grainy photographs proof of mysterious, hidden alien structures on Mars? Probably not, but it has not stopped self-proclaimed alien and UFO 'experts' from claiming a series of ...

Tabby’s Star in infrared (left) and ultraviolet (right). Credit: Wikipedia There are three ways to look for evidence of alien technological civilizations. One is to look out for deliberate attempts by ...