Uranus and Neptune have been called the “ice giants” for decades. But in new research, that nickname might be more a misnomer ...

What if our understanding of Uranus and Neptune's compositions have been wrong, specifically regarding their classifications ...

A mysterious space object named 2023 KQ14, nicknamed “Ammonite,” challenges theories about the mysterious and possible Planet ...

What can sub-Neptunes, exoplanets whose sizes are between Earth and Neptune, and which are between the known for their water-rich compositions, teach astronomers about both where and how to find life ...

TOI-421 b is a scorching hot sub-Neptune planet with a mass around 7 times that of Earth that orbits its star at a distance equivalent to around 6% of the distance between our planet and the sun.

One of the most notable properties of the giant planets in our solar system—Jupiter, Saturn, Uranus and Neptune—are the ...

A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and ...