The universe is vast and teeming with stars – but if intelligent life exists, it may not be able to visit Earth.

Could the galaxy’s third confirmed interstellar visitor be an alien probe? The now christened comet 3I/ATLAS is sweeping past Earth at a safe distance of about 170 million miles, and while speculation ...

Every few years, a new “mystery metal” surfaces and the internet races to declare it proof that we are not alone. Shiny shards, polished spheres, and desert monoliths are quickly framed as alien ...

A Pentagon release of new UFO footage has revived the question of whether aliens could realistically travel to Earth.