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 ...

Off the coast of Chile there’s an island filled with mysterious monolithic structures that hold secret powers. See more in ...

What if aliens were building a massive power plant?Last time, I talked about the "Kardashev scale," which classifies the ...

New theoretical models have strengthened the case that immense, energy-harvesting structures orbiting their host stars could exist in principle in distant stellar systems. With the right engineering ...