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

The robotic Tianwen-2 spacecraft will collect samples from Kamoʻoalewa, which some scientists suspect is a fragment of the moon.

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.

Our solar system’s origin story spans billions of years and involves clouds of gas, cosmic collisions, and planetary ...

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

Researchers from Rice University claim to have fresh evidence of Planet Nine - as well as a method to find it.

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 ...

Much was riding on Flight 9 for Elon Musk’s giant moon and Mars rocket after debris from January and March flights fell into ...

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