The most crowded alien planetary system found yet possesses five worlds all orbiting a star at least 12 times closer than Earth does the sun, researchers say. Investigators discovered these exoplanets ...

Our galaxy is full of strange worlds, but what would happen if we could bring some of them into our own Solar System? Moving exoplanets closer helps us imagine how different stars, atmospheres, and ...

Researchers tested whether they could detect unusual radio signals coming from an interstellar object passing through our ...

Scientists from the U.S. Department of Defense and Harvard University have announced that aliens may be monitoring Earth by sending small surveillance probes into the solar system. Mr. Loeb is an ...