When sonar first picked up a massive, stair‑like object on the floor of the Baltic Sea, the image looked less like geology and more like a movie prop. The structure’s circular outline, sharp edges and ...

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 ...

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 ...