"This is a big step in understanding the outer solar system," team leader Rosemary Pike from the Center for Astrophysics | ...

Researchers use the Subaru Telescope in Hawaii to find a small object on the outer edge of the Solar System. Nicknamed ...

There are a lot of worlds beyond the orbit of Neptune. Some are dwarf planets, while many others are much smaller rocks ...

Ammonite was discovered using the Subaru Telescope in Hawaii, with follow-up confirmation from the Canada-France-Hawaii ...

The Solar System is a vast and mysterious realm, filled with planets, moons, asteroids, and icy bodies waiting to be ...

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

A team of astronomers led by the Center for Astrophysics | Harvard & Smithsonian has discovered a rare object far beyond ...

The discovery, published in The Planetary Science Journal, was made through the Large inclination Distant Objects (LiDO) ...

Voyager 2, NASA's longest-running mission, explored Neptune during a historic encounter on Aug. 25, 1989, sending back humanity's first close-ups of the planet.

New images released from NASA's James Webb Space Telescope are revealing Neptune, and the planet's hard-to-detect rings, in a fresh light.

Scientists had previously believed that no celestial bodies existed in the vast, empty section of space beyond Neptune.