PARIS - It’s an evocative idea that has long bedevilled scientists: a huge and mysterious planet is lurking in the darkness ...

A US-based trio hunting "Planet Nine" has instead stumbled on what appears to be a new dwarf planet in the solar system's ...

Discovery of a possible dwarf planet suggests our cosmic backyard holds many more secrets to uncover It is an evocative idea ...

Learn how a possible ninth planet, the theoretical Planet X, could have acquired its wide orbit in the outer Solar System - a ...

Astronomers have just discovered a new celestial body in our solar system that could challenge major space theory. 2017 OF201 ...

Simulations show that the stars’ tug could send Mercury, Venus or Mars crashing into Earth — or let Jupiter eject our world from the solar system.

T hree cheers for Liberal MP Andrew Hastie, a potential party leader, for speaking the plain truth on the ABC’s Four Corners.

Cheng, together with graduate students from Princeton University, discovered the potential dwarf planet while searching for ...

Planets with unusually wide orbits may be normal by-products of the formation of planetary systems. This is suggested by new simulations.

SpaceX's Starship rocket roared into space but then spun out of control about halfway through its flight, failing to complete ...

Scientists are intrigued after spotting a highly unusual celestial object lurking at the very edge of our solar system. It's ...

A test flight of SpaceX's Starship rocket has failed for the third time in a row.