Episode 2: The alien underground. Half a mile below the surface of the earth, in a cave too hot to explore without an ice-packed suit, NASA scientist and Nat Geo explorer Penny Boston clambers ...

Sitting just 50 light-years from Earth, the beady-eyed exoplanet LHS 1140 b may be a candidate for alien life thanks to its ...

The ATA is the only facility on the planet built expressly for detecting signals from alien civilizations. Funded largely by the late Microsoft co-founder Paul Allen, it was envisioned as an ...