If the object really is Planet Nine, it would be larger than Neptune and exist 700 times further from the sun than Earth.

The presence of another planet in the solar system could explain the odd movements of some of the bodies in the Kuiper Belt.

Using two infrared space telescopes and a 23-year gap, scientists may have spotted a mysterious, slow-moving object beyond ...

A new look through decades-old data has unveiled some of the most compelling evidence yet of a hidden ninth planet in the far ...

Astronomers have detected a promising sign of a ninth planet lurking at the the farthest reaches of the Solar System.

Jupiter and Mars shine in the evening, more planets gather in the morning, and the Eta Aquariid meteors join in.

A Soviet-era spacecraft meant to land on Venus in the 1970s is expected to soon plunge uncontrolled back to Earth.

Mars starts May not far from the Beehive star cluster, Venus is unmistakable in the predawn sky, and Mercury looks best early ...

Sir David Attenborough is reflecting on his life in a new documentary about the health of the world’s ocean. Attenborough ...

The much-anticipated Roadster X, introduced last year, will now begin reaching customers a month later than promised, Ola ...

VISITORS have just over one week left to see a breathtaking installation of Mars inside Colchester Castle. Luke Jerram's six-metre-diameter spherical sculpture of the Red Planet is on display until ...

Sir David Attenborough has made a powerful declaration about his mortality as the British broadcaster approaches his 99th ...