A rare discovery beyond Neptune is forcing scientists to rethink early solar system dynamics and the forces that shaped ...

The Voyager spacecraft has made a groundbreaking discovery at the edge of our solar system—an astonishing 50,000-degree wall ...

The boundary of a solar system is not defined by planets, but by gravity. Beyond Pluto and the Kuiper Belt lies the Oort Cloud, extending up to a light year from the Sun and still considered part of ...

The comet, discovered in July 2025, originated far beyond our Solar System and is thought to be around 7 billion years old - ...

NASA has taken a major step toward one of its most ambitious science goals as it searches for signs of life on planets beyond our solar system ...

CAPE CANAVERAL, Fla. (AP) - Astronomers may have found the first moon outside our solar system, a gas behemoth the size of Neptune. Plenty of planets exist beyond our solar system, but a moon around ...

A mysterious interstellar comet — just the third such object ever confirmed to have entered our solar system — streaked past Mars last week. A spacecraft in orbit around the red planet had a front-row ...

Our Sun’s outer atmosphere, the corona, is millions of degrees hotter than it should be, and no one knows why.