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

A new study suggests that a tiny, icy world beyond Pluto harbors a thin, delicate atmosphere that may have been created by ...

Astronomers have detected a thin atmosphere around the icy trans-Neptunian object (612533) 2002 XV93, making it the smallest known body with such a feature. Located over 3.4 billion miles from Earth, ...

Sky This Week is brought to you in part by Celestron. Friday, May 8Pluto is stationary at 7 A.M. EDT in Capricornus, although ...

3I/ATLAS is not just another comet drifting by. This object likely formed around another star, may be older than our Sun, and ...

A rare observation opportunity revealed the presence of a thin atmosphere around a small object beyond Pluto.

The galaxy’s most common stars rarely host sub-Neptune planets, revealing a new pattern in how close-in worlds form.

Astronomers have uncovered a massive new trans-Neptunian object, 2017 OF201, lurking at the edge of our solar system. With an orbit stretching 25,000 years and a size that may qualify it as a dwarf ...

Two decades ago, the International Astronomical Union—which defines and names celestial bodies—redefined the criteria for ...

A bizarre planetary pairing 190 light-years away is challenging everything astronomers thought they knew about how worlds form. A “lonely” hot Jupiter — typically found without nearby companions — is ...

A tiny world in our Solar System has an atmosphere it shouldn’t—hinting something dramatic happened there recently.