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 ...

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 ...

Mundane wayward space snowball, or extraterrestrial visitor? Astronomers believe that our solar system’s latest and only third ever confirmed interstellar visitor, 3I/ATLAS, is almost certainly a ...