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 ...

A new Canadian-led mission proposal could redefine how scientists search for habitable planets beyond our solar system, ...

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

Even at a glance, the planets in our solar system are wildly diverse. Huge and small, airless and densely packed with atmosphere, they have a wide range of characteristics distinguishing them. But if ...

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 ...