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

Large Telescope observations of interstellar comet 2I/Borisov has revealed that it is "one of the most pristine ever observed ...

In July 2025, astronomers spotted something remarkable passing through our Solar System, an object that had not come from ...

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 ...

A Harvard University cosmologist who has suggested alien life forms could be sailing into the solar system disguised as meteors is leading the Trump administration’s secretive new scientific advisory ...

Avi Loeb, a cosmologist who studied black holes and served as head of Harvard’s astronomy department until 2020, was recently appointed to helm a new scientific advisory council tasked with ...

Astronomers have revealed new details about the makeup and age of a visiting comet that was born around a distant star. They ...

I/ATLAS arrived fast, bright, and strange. When astronomers spotted it on July 1, 2025, they knew almost immediately this was no ordinary comet.

The retired space shuttle will look launch-ready at its new home in California. NASA’s never-before-attempted plan to move a sensitive scientific satellite into a safer orbit has faced a week of ...