The object is about 700 kilometres wide and lies nearly three times farther from Earth than Neptune. Its highly elongated ...

The small world was found during a search for the hypothetical Planet Nine, and astronomers say the next time it will reach ...

Earth has a new neighbor that lives far, far away. Scientists from the Institute for Advanced Study's School of Natural ...

As it orbits the sun once every 25,000 years, the celestial body 2017 OF201 travels beyond the Kuiper Belt into a region ...

Spotted beyond Neptune, the newly identified object follows an odd path through space, one that complicates a decades-old ...

It's an evocative idea that has long bedeviled scientists: a huge and mysterious planet is lurking in the darkness at the ...

New research suggests that Jupiter, the largest planet in our solar system, was once even bigger—about twice its current size—and had a magnetic field 50 times stronger than it does today. This ...

China launched its first asteroid sample-return mission, Tianwen-2, in the early hours of Thursday, an endeavour to shed ...

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

A new analysis of planet formation models estimates the odds of a theoretical Planet Nine orbiting our sun at 40% given ...

"It's astonishing that even after 4.5 billion years, enough clues remain to let us reconstruct Jupiter's physical state at the dawn of its existence," stated Fred C. Adams, professor of physics and ...