A gradual dimming and brightening when a star passed behind it suggested the mini-Pluto was wrapped in a thin layer of air.

A new study suggests that a tiny, icy world beyond Pluto harbors a thin, delicate atmosphere. That would make it the solar ...

If confirmed, the rock would become just the second world past Neptune in our solar system to host an atmosphere.

Paytan, distinguished professor of Earth and planetary sciences, and Lin, emeritus distinguished professor of astronomy and ...

The Nu ring seems to be fed by unknown rocky bodies, whereas the Mu ring appears rich in water ice and linked to the moon Mab ...

Rings were first discovered in 1977 around Uranus, when astronomers observed a star dim multiple times as the planet passed ...

Rings were first discovered in 1977 around Uranus, when astronomers observed a star dim multiple times as the planet passed ...

One of the rings is hinting at the presence of additional undiscovered moons to add to the 29 already found to orbit Uranus. When you purchase through links on our site, we may earn an affiliate ...

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

Venus and Jupiter make good targets for skywatchers this month. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. After a "celestial sabbatical" of ...

The standard story of the origin of our solar system has gone like this: 4.6 billion years ago, a giant cloud of dust hung frozen in space. Then the explosion of a nearby star caused part of that dust ...

If you examine our solar system’s giant planets, you’ll notice right away that they’ve all got moons—a lot of moons. While Earth only has the one, Jupiter has about 100 that we know of (and likely ...