According to study co-author Dr Fumi Yoshida, Neptune is the only known massive object near the outer Solar System that could ...

The Keck Observatory and NASA’s Hubble Space Telescope may have uncovered a "potential three-body system in the Kuiper Belt," ...

NASA launched New Horizons to explore Pluto. In 2019, it visited the furthest object in the Solar System we have seen up ...

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

Planet Nine should appear stationary over the course of a single day but show detectable movement over months.

The Kuiper Belt is an elliptical plane in space spanning from 30 to 55 times Earth's distance from the sun, or 2.5 to 4.5 billion miles (4.5 to 7.4 billion kilometers).

Pluto and some other known dwarf planets meet the first two criteria but not the third because they orbit in the Kuiper Belt, a region beyond Neptune filled with small icy debris. When Pluto was first ...

The Kuiper Belt, which lies around Pluto, is a massive component of our solar system. It’s home to several small planets, including Makemake, Eros, and, of course, Pluto.

The Kuiper Belt is home to Pluto and thousands of other worlds of varying size. Most of the bodies there are made from the building blocks of our solar system, long since cordoned to distant cold ...

As Kuiper Belt objects piled up, the importance of the hard-won discovery became apparent: The solar system was not the “boring” place many scientists had thought.