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

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

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, ...

Researchers in the U.S. have found evidence that a large planet may have existed billions of years ago - before meeting a ...

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

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

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 ...

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

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

In the latest research, telescope observations of 3I/ATLAS examine its chemical structure and suggest that it took shape in a ...