New discoveries of objects in the Kuiper Belt have also presented challenges for the Planet Nine theory. The latest is known ...

Nearly a month ago, a mysterious object was seen hurtling through the solar system and later confirmed as an interstellar ...

There’s a visitor in town, and its name is 3I/ATLAS. The presumed interstellar comet presents a rare opportunity for ...

Evidence that rocky planets beyond Jupiter formed as rapidly, and at the same time, as the inner planets could transform our ...

"It is possible that a planet once existed in the solar system but was later ejected, causing the unusual orbits we see today ...

The solar system consists of eight planets, several dwarf planets, hundreds of moons, and billions of asteroids, comets and ...

International astronomers have for the first time witnessed the birth of a planetary system beyond Earth's sun that could one ...

Pamela Anderson Baked Sourdough Bread For “The Naked Gun” Costar Liam Neeson — and He Shares His Review (Exclusive) ...

Astronomers first identified these minerals using the now-three-year-old James Webb Space Telescope. To see where exactly the ...

Astronomers have observed an object that originated from beyond our solar system, thought to be an interstellar comet, speeding through our celestial neighborhood.

Astronomers have confirmed the third interstellar object on record is dashing through our solar system. Dubbed 3I/ATLAS, it ...

Jupiter is already the biggest planet by far in our solar system, but new research suggests it was somehow once even larger than it is now. Twice as large, in fact. To put that into context, those ...