Astronomers have uncovered a massive new trans-Neptunian object, 2017 OF201, lurking at the edge of our solar system. With an ...

The solar system lost its ninth planet back when Pluto was demoted to a dwarf planet, but research might indicate that there ...

A new trans-Neptunian object, 2017 OF201, has been found with a vast orbit and potential dwarf planet size. The finding hints ...

Astronomers have picked up evidence of an Earth-sized world, distinct from the previously hypothesised Planet Nine and Planet ...

As the search for "Planet Nine" in the outer solar system continues, new research suggests there may be an Earth twin buried deep within the frozen waste of the Kuiper Belt beyond Neptune ...

Outer solar system scientists have prepared three mission concept studies considering what flagship missions to Enceladus, Neptune and Triton, and Pluto could do.

Every year, the Hubble Space Telescope conducts a grand tour of the outer solar system planets, checking their turbulent atmospheres for changes in weather, storms, clouds and colors. This year ...

Astronomers using ALMA have discovered that planet-forming discs are not flat and serene but subtly warped, reshaping our ...

The solar system's group of outer planets include Jupiter, Saturn, Uranus, and Neptune. The Hubble Space Telescope takes photos of these planets annually.

NASA's Hubble Space Telescope has returned a batch of incredible close-up photos of the planets Jupiter, Saturn, Uranus and Neptune.