The finding offers fresh insight into our solar system’s farthest, coldest objects in a region known as the Kuiper Belt.

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

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

Pluto was believed to be the only body beyond Neptune with an atmosphere. Now, a new discovery in our solar system is ...

Astronomers have spotted something surprising in the far outer Solar System—a faint, short-lived atmosphere clinging to a ...

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

These data come from the National Oceanic and Atmospheric Administration’s Mauna Loa Observatory, which may soon be shut down ...

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

The atmosphere is between 5 million and 10 million times thinner than Earth's atmosphere. A very small body, far from the sun ...

A brief stellar eclipse suggests the tiny 2002 XV93 has a thin atmosphere — a first for any solar system body farther from ...

A team of professional and amateur Japanese astronomers have found evidence for a thin atmosphere around a small body in the ...