Add Yahoo as a preferred source to see more of our stories on Google. An illustration showing Planet Nine, a hypothetical, undiscovered planet in our solar system. New research now suggests the ...

The solar system lost its ninth planet back when Pluto was demoted to a dwarf planet, but research might indicate that there ...

Six orbits were aligned. 0.007% probability of coincidence, 3.8σ significance, estimated mass of at least 10 Earth masses, ...

What if Jupiter gained just a little bit more mass during its formation period, and then ignited to become a star? How ...

Add Yahoo as a preferred source to see more of our stories on Google. An artist's impression of a planetary system with four planets, around a small red star, called LHS1903 with a large reddish-brown ...

A star and its planets form when a cloud of gas and dust collapses in on itself somewhere in space. The cloud then forms a ...

Artist’s concept of a planet far from its home star. A new study said that wide-orbit planets could be a natural result of chaotic early solar system formation. Such planets would lend support to the ...

In a new study, astronomers detail observations of what could be the first known exosatellite - a natural object orbiting a ...