Astronomers Detected Water Clouds on Brown Dwarf

Researchers identified water clouds on WISE 0855, the coldest brown dwarf found to date, using the James Webb Space Telescope.

Updated on Oct. 10, 2026 in Space

A massive, hazy brown dwarf orb with swirling atmospheric cloud bands floating in the dark expanse of deep space. — University of Arizona researchers used the James Webb Space Telescope to identify water clouds on WISE 0855, the coldest brown dwarf ever discovered. AI Illustration. Upload story photo >

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A team led by the University of Arizona's Steward Observatory used the James Webb Space Telescope to observe WISE 0855. This Jupiter-sized brown dwarf, located 7.5 light-years from Earth, is the coldest object of its kind ever discovered.

Why it matters

Identifying cloud compositions on distant celestial bodies helps scientists understand the atmospheres of planets beyond our solar system. This discovery marks a significant step in characterizing cold, low-mass objects that bridge the gap between stars and planets.

WISE 0855 is approximately the size of Jupiter and sits 7.5 light-years away from Earth. The observation was conducted using the James Webb Space Telescope to analyze this record-setting cold brown dwarf.

The players

Brittany Miles

She is a researcher leading the study at the University of Arizona's Steward Observatory.

James Webb Space Telescope

This is a powerful space-based observatory designed to conduct infrared astronomy.

Steward Observatory

This facility is part of the University of Arizona and hosts advanced astronomical research teams.

WISE 0855

This celestial body is a brown dwarf noted for being the coldest of its kind yet identified.

The details

Astronomers utilized the infrared capabilities of the James Webb Space Telescope to peer through the atmosphere of the cold brown dwarf. The study was directed by a research team at the University of Arizona's Steward Observatory.

October 10, 2026: Findings regarding the discovery were officially published.

The Big Picture

The discovery follows the pattern set by the James Webb Space Telescope's atmospheric characterization program to analyze the composition of distant substellar objects. This finding shifts scientific understanding of how water vapor persists in the atmospheres of the coldest brown dwarfs.

This research provides a template for analyzing the atmospheres of planets that are otherwise too cold or small to detect easily. Such studies refine the technology needed to identify potential water-bearing worlds in the future.

The takeaway

This discovery confirms that even the coldest objects in space can possess complex atmospheric features like water clouds. It demonstrates the growing capability of modern telescopes to characterize the chemical makeup of distant, dim objects in our galactic neighborhood.