After a decade-long search, some scientists say a growing number of clues point to the existence of a hidden planet in the ...

The Sun is the largest object in the Solar System. The Sun’s huge gravitational field keeps many other objects – planets, dwarf planets, asteroids and comets – in orbit around it.

Astronomers are investigating the possibility of a hidden ninth planet beyond Neptune, which could explain unusual orbital patterns in the Kuiper Belt.

When it came to discovering Neptune, scientists didn’t need to see to believe. The eighth planet in our solar system was ...

This showed him the planet was in fact in orbit around the Sun ... they are found further out in our solar system.” Given this distance and their pattern of movement, it’s easy to see how ...

NASA's technology-demonstrating Advanced Composite Solar Sail System (ACS3) has a bent boom in Earth orbit, a newly released photo shows. The ACS3 spacecraft launched April 23 to test key aspects ...

a protective bubble created by the Sun that extends beyond the orbit of Pluto The Voyager 2 probe, which left Earth in 1977, has become the second human-made object to leave our Solar System.

The study tracks icy bodies subject to some kind of perturbation that’s injecting them into the orbit of Neptune before they leave the solar system entirely ... all of the patterns that ...