James Webb Telescope Spots ‘Failed Stars’ in Stunning Cluster
- Where it is: 20,000 light-years from Earth, in the constellation Carina
- Bordered by orange and brown clouds of gas and dust and filled with shimmering stars, this new image from the James Webb Space Telescope appears to show a...
- In reality, it features a prominent star cluster known as Westerlund 2, which is located within a star-forming nebula known as gum 29.
Fast facts
What it is indeed: The star cluster Westerlund 2
Where it is: 20,000 light-years from Earth, in the constellation Carina
When it was shared: Dec. 19, 2025
Bordered by orange and brown clouds of gas and dust and filled with shimmering stars, this new image from the James Webb Space Telescope appears to show a portal to a cosmic wonderland.
The sparkling cluster is compact, measuring between 6 light-years and 13 light-years in diameter, and it is home to approximately 3,000 stars, according to a statement from the European Space Agency. Seen here at a young age of about 2 million years, this cluster contains some of the hottest, brightest and most massive stars in our galaxy.
Westerlund 2 was also captured by the Hubble Space Telescope 10 years ago to commemorate Hubble’s 25th anniversary in orbit. That image, created using visible light and some near-infrared data, revealed the complex features of the cluster and its surrounding nebula, showcasing a stunning landscape of pillars, ridges, and valleys of dust.
Now, the James Webb Space Telescope has revealed an even more vibrant view of the cluster, which is teeming with shining young stars. This latest portrait combines infrared data from the telescope’s Near-Infrared Camera and Mid-Infrared Instrument.
The stunning image highlights not only the young, massive stars but also the clouds and walls of dust shaped by their intense light. These sculpted regions are surrounded by wisps of orange and red gas, brilliantly illuminated by the powerful light of the nearby stars.
The entire scene is interconnected by a network of blue and pink wisps that appear to be material drifting off the scene. Several tiny stars look like they have just begun
Brown Dwarfs: Stars or Planets?
Table of Contents
Brown dwarfs are celestial objects with masses between those of the largest gas giant planets and the smallest stars, specifically ranging from approximately 13 to 80 times the mass of Jupiter (NASA Exoplanet Exploration). Unlike stars, they lack the sufficient mass to sustain stable hydrogen fusion in their cores, preventing them from achieving true star status.
These “failed stars” emit heat and light, but much less than true stars, and gradually cool and fade over time. Their discovery blurred the lines between planets and stars, leading to a re-evaluation of definitions.
For example, the brown dwarf WISE 0855−0714, discovered by NASA’s Wide-field Infrared Survey Explorer (WISE), is estimated to have a temperature similar to Earth’s and exhibits water in its atmosphere, further highlighting the planetary characteristics of some brown dwarfs.
James Webb Space Telescope and Brown Dwarf Research
The James Webb Space Telescope (JWST) is providing new opportunities to study brown dwarfs in detail, offering insights into stellar evolution and planet formation.
JWST’s infrared capabilities allow astronomers to penetrate the dust and gas surrounding brown dwarfs, revealing their atmospheric composition and temperature profiles. this data helps scientists understand the different stages in a star’s life and the processes involved in the formation of planet-forming disks around more massive stars. Specifically, JWST can analyse the molecules present in brown dwarf atmospheres, providing clues about their formation and evolution.
In December 2023, JWST detected silicate sand clouds on a brown dwarf named VHS 1256 b, demonstrating the telescope’s ability to observe weather patterns on these objects. This discovery provides evidence of similar weather phenomena occurring on both brown dwarfs and gas giant planets.
Planet-Forming Disks Around Brown Dwarfs
Planet-forming disks, typically associated with young stars, have also been observed around some brown dwarfs. These disks are composed of gas and dust, the building blocks of planets.
The presence of disks around brown dwarfs challenges traditional theories of planet formation, as these objects lack the central mass to efficiently accrete material into planets. However, observations suggest that planets may still form in these disks through option mechanisms, such as gravitational instability.
For instance, in 2011, astronomers discovered a planet candidate, Kepler-16b, orbiting a binary star system containing a brown dwarf, demonstrating that planets can exist in unusual environments.
Current Status (as of January 18, 2026)
Research on brown dwarfs remains an active field of astronomy. As of January 18, 2026, there have been no major paradigm shifts in the understanding of brown dwarfs as the initial discoveries highlighted above. JWST continues to provide valuable data,refining our knowledge of their atmospheric properties and formation processes. ongoing studies are focused on identifying more planets orbiting brown dwarfs and understanding the conditions necessary for planet formation in these unique environments.Recent reports indicate continued observations and analysis of brown dwarf atmospheres using JWST.