The Hubble Space Telescope has peered at Uranus, left, and Neptune to study the so-called "ice giant" planets, but little is known about their interior composition. - NASA / ESA / M. Showalter / L.

Even at a glance, the planets in our solar system are wildly diverse. Huge and small, airless and densely packed with ...

A new tiny ice world has been discovered beyond Pluto surrounded by a thin atmosphere, scientists revealed.

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 ...

MIT astronomers using the James Webb Space Telescope have discovered that a rare "planetary odd couple", a hot Jupiter and a ...

Astronomers have identified another object from this realm, with a diameter of roughly 310 miles (500 km), that has an ...