A team of astronomers believe they may have discovered a new dwarf planet—just like Pluto—on the edge of our solar system.

Today, it’s believed that Jupiter and Saturn, the largest planets, were the first to fully form, both within a few million ...

A small team led by Sihao Cheng, Martin A. and Helen Chooljian Member in the Institute for Advanced Study's School of Natural ...

China's ambitious Tianwen-2 mission will soon be heading to two extremely different space rocks, and should provide vital ...

Jupiter, the largest planet orbiting the sun, used to be much bigger and stronger when the solar system was just beginning to ...

A new member of the solar system has been detected, the second-largest of its kind, suggesting there may be more like it ...

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

Astronomers have discovered a mysterious dwarf planet, 2017 OF201, far beyond Pluto. This discovery challenges existing ...

Astronomers find evidence of a possible ninth planet beyond Neptune, reigniting the debate about the formation of the Solar ...

A recent study found that Jupiter was once twice the size that it is now, making it big enough to swallow up 2,000 Earths.

Astronomers have announced the discovery of a new dwarf planet in our solar system, named 2017 OF201. Located far beyond ...

A new dwarf planet, discovered beyond Neptune and described as Pluto's 'cousin,' could void the hypothesis of a Planet X in ...