If alien civilizations rise and fall, they may leave behind artifacts long after they are gone. From abandoned megastructures to quiet machines orbiting dead stars, these relics could tell stories no ...

Astronomers are adopting new strategies in the search for extraterrestrial intelligence. A study in Monthly Notices of the Royal Astronomical Society suggests using Earth’s shadow to detect alien ...

A strange interstellar object is hurtling its way toward our pale blue dot — and according to a Harvard astronomer, there’s a chance it’s not a benign asteroid or comet, but instead some harmful form ...

First contact with alien civilizations won’t be with the beings themselves, but with their technology. By searching for these extraterrestrial artifacts, we embark on a journey through our solar ...