Earth’s deep past leaves plenty of unanswered questions. None currently proves an alien visit, but scientists know the ...

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

You might think this column is about UFOs and the Pentagon's recent declassified files. It's not. We're talking about technosignatures, the evidence of alien technology: a radio or laser signal, ...

An alien invasion might sound like science fiction, but a scientist has now revealed what the terrifying consequences of an encounter might be. Professor Avi Loeb, head of Harvard University's Galileo ...