Europe is quietly positioning itself to attempt one of the most audacious missions in planetary exploration: a dedicated landing on Enceladus to look directly for signs of alien biology. Instead of ...

The Manhattan-sized interstellar visitor hurtling through space has captured the imaginations of UFO watchers for months and ...

The eyes of every astronomer widened this year when an interstellar traveler was discovered in our solar system. Despite some suggestions that it could be an alien spacecraft, observations from some ...