Two massive planets may have once existed in early solar system before being ejected, leaving behind evidence in unusual ...

The Solar System is far more diverse in size than it appears from Earth. From tiny rocky worlds to massive gas giants, each ...

About 1,113 light years away from Earth, locked in orbit around a single star, there are two planets that appear to be the ...

Add Yahoo as a preferred source to see more of our stories on Google. (Ianm35/iStock/Getty Images Plus) The Solar System is one of the comforting constants of human existence. No matter what else we ...

NASA’s TESS discovered two Jupiter-sized “super-puff” planets lighter than cotton candy, 1,100 light-years away.

The planets are extremely large, with TOI-791 b being about the same size as Jupiter, and TOI-791 c even larger. Yet, they ...

The rusty world is full of mysteries—and some of the solar system's most extreme geology. Learn more about Earth's smaller, colder neighbor.

Scientists may have discovered a dwarf planet far beyond Neptune — an unearthing that may disprove a longstanding theory about the possibility of a giant ninth planet. The dwarf planet's existence ...

So far, humanity has yet to find its first "exomoon"—a moon orbiting a planet outside of the solar system. But that hasn't been for lack of trying. According to a new paper by Thomas Winterhalder of ...

A pair of sibling gas giants originally spotted by citizen scientists are so lightweight that their density resembles wispy ...

Rain is usually made of water, but elsewhere in the Solar System the weather can be unimaginably different. Scientists from ...