Earth already contains organisms that survive conditions humans could never endure. Alien life, if it exists, may force ...

The United States is stepping back from the most direct test yet of possible alien biology on Mars just as new telescopes and probes are racing ahead to hunt for life light‑years away. Lawmakers have ...

Alien life may not need the kind of home humans instinctively search for. Some of the strangest possibilities begin once ...

“USA250: The Story of the World’s Greatest Economy” is a yearlong WSJ series examining America’s first 250 years. Read more about it from Editor in Chief Emma Tucker. Imagine the first convincing ...

Claims that aliens are already here are everywhere, but proving them is another matter. The strongest cases become more ...

Is it the invasion of the genome snatchers? Just in case the idea of aliens walking around in human skin suits wasn’t frightening enough. An outlandish study asserts that aliens might have abducted us ...