In the remote outer reaches of planetary systems, far beyond the orbit of known planets, enormous and mysterious worlds ...

For years, astronomers have been searching for a mysterious ninth planet lurking in the dark outer reaches of our solar ...

Astronomers on Wednesday confirmed the discovery of an interstellar object racing through our Solar System -- only the third ever spotted, though scientists suspect many more may slip past unnoticed.

An object that appears to be from beyond our Solar System has been spotted hurtling towards the Sun, which if confirmed would ...

A possible new dwarf planet has been discovered at the edge of our solar system, so far-flung that it takes around 25,000 years to complete one orbit around the sun. The object, known as 2017 ...

The study went on to note that a cause for the pulse could have been that it was struck by a small piece of space rock, known ...

Astronomers discovered that C/2014 UN271, a massive comet more than 10 times larger than any known comet, is emitting jets of ...

This discovery has significant implications for the current understanding of the layout of our outer solar system. 5 2017OF201 takes about 25,000 years to orbit the sun.

For years, scientists have puzzled over why Earth and Mars are missing certain key elements. Now, a fresh study suggests ...