Scientists may have discovered a dwarf planet far beyond Neptune — an unearthing that may disprove a longstanding theory ...

Centimeter-sized pebbles have been detected in protoplanetary discs using e‑MERLIN, filling in a critical phase of planet ...

A fascinating glimpse into how a solar system like our own is born has been revealed with the detection of planet-forming ...

While some astronomers remain unconvinced that such a plant exists, this new work isn’t the first to posit the existence of a ninth planet in our cosmic community.

A stunning photo taken in Somerset has showed every single planet in the solar system at the same time during a rare alignment that won't happen again until 2040.

A supposed “planet nine” that lies hidden at the edge of our solar system could actually be something else entirely, according to scientists.

A team of international scientists have uncovered compelling visual evidence for a massive, mysterious ninth planet hidden in the outer reaches of our solar system.

Planet Nine is a hypothesised planet that is five to 10 times the mass of Earth, orbiting in the outer solar system at about 400 to 800 times the Earth-sun distance.

Artist's impression of Planet Nine – a suspected “wide-orbit” planet – with the Sun in the distance; Neptune's orbit is shown ...

Our solar system may have a ninth planet after all, following the declassification of Pluto nearly two decades ago, researchers say.

A powerful new observatory is the best hope yet for finding the elusive Planet 9, a large planet that some scientists say is hidden in our solar system.

After a decade-long search, some scientists say a growing number of clues point to the existence of a hidden planet in the Kuiper Belt beyond Neptune — and they may soon have the opportunity to ...