NASA and Arizona-based startup Katalyst launched a robotic spacecraft over the Pacific on Thursday on a mission to rescue an ...

A three-armed spacecraft is rushing to the rescue of a NASA telescope that’s in danger of crashing back to Earth.

When the U.S. was born, humanity was still seven years away from balloon-borne flight. Where might we be another 250 years from now, should the nation be fortunate enough to survive that long?

A rush rescue mission to save a NASA space telescope remains grounded, this time because of a last-minute launch problem.

A polarizing Harvard astronomer known for splashy theories about alien visits has been tapped by the Trump administration to lead a team of outside scientists to study the national security risks ...

Avi Loeb, a Harvard astronomer who has made headlines with his theories about alien encounters, will lead a White House ...

Harvard astrophysicist Avi Loeb argues 3I/ATLAS and other interstellar objects may hint at alien technology, drawing fame, ...

A rare visitor from another star system prompted SETI to hunt for alien technology, but the mysterious object appears to be a ...

With the release of Disclosure Day, Steven Spielberg’s new film about aliens, a question as old as science fiction itself resurfaces: if aliens were to arrive on Earth, would they come to conquer us, ...

The United States government’s recent release of hundreds of previously classified Unidentified Anomalous Phenomena (UAPs) cases spanning the 1940s to the present, along with the new Steven Spielberg ...