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

A new study proposes searching the moon for remnants of ancient extraterrestrial technology. Researchers suggest the moon's surface could preserve microscopic "technosignatures" left by alien ...

We may be able to find evidence of advanced alien civilizations in pulverized traces of their technology. Oxford astrophysicist Brian Lacki argues in a new, yet-to-be-peer-reviewed paper that, instead ...

Some UFO cases remain difficult to explain, but that is only the beginning of the scientific question. The evidence needed to ...

If ancient extraterrestrial explorers ever traipsed through Earth's cosmic neighborhood, it's possible they left behind some interstellar litter in their wake. Think of it like the loose hubcaps on ...

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, ...