Where does the solar system end and interstellar space begin? That's a question scientists have been working to answer using ...

New James Webb observations are changing how scientists see the frozen edge of the solar system. Webb has mapped Uranus in new detail, brought distant rings and storms back into focus, and helped ...

As the United States prepares to celebrate its 250th anniversary, the history of the solar system tells its own story of ...

Just over a year ago, interstellar comet 3I/ATLAS was discovered. It was seen crossing into the inner Solar System and into ...

PARIS, France — An interstellar comet that blazed past the Sun last year could be nearly three times older than our Solar System and is unlike anything ever before seen in our cosmic backyard, ...

The outer solar system once seemed like a quiet backwater. But a glut of tiny, strange moons with unruly orbits are coming into view, revealing hints of a surprising past – and the origin of Saturn's ...

Based on the composition of gases spewed by the icy space rock, researchers estimate that our guest might be up to 12 billion years old—about three times the age of the solar system ...

Learn about the formation of the grains within many meteorites, emerging from collisions of planetary bodies in the early ...

While life on Mars (and Venus) has long been an obsession for those wondering if we're alone, there are other places in our ...

Scientists have discovered a bizarre planetary system where a rocky world orbits farther out than giant gas planets, defying long-standing theories of planet formation. The finding hints that some ...

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