Webb looks into the cradles of star clusters, finds massive clusters emerge faster
6 May 2026
Astronomers using the NASA/ESA/CSA James Webb Space Telescope together with the NASA/ESA Hubble Space Telescope have looked deeply at thousands of young star clusters in four nearby galaxies, studying clusters at different stages of evolution. Their findings show that more massive star clusters emerge more quickly from the clouds they are born in, clearing away gas and filling the galaxy with ultraviolet light. The result gives us a more detailed understanding of star formation in galaxies, as well as how and where planets can form.
Article link:
https://esawebb.org/news/weic2608/
Video [1:25]
Video Description:
Astronomers using the NASA/ESA/CSA James Webb Space Telescope together with the NASA/ESA Hubble Space Telescope have looked deeply at thousands of young star clusters in four nearby galaxies, studying clusters at different stages of evolution. Watch this Space Sparks episode to learn more.
Credit:
ESA/Webb, NASA & CSA, A. Pedrini, A. Adamo (Stockholm University) and the FEAST JWST team, N. Bartmann (ESA/Webb)
Pic Description[Top]:
This image shows a section of one of the spiral arms of Messier 51 (M51), one of the four galaxies studied in this work, as seen by Webbโs Near-Infrared Camera (NIRCam). The thick clumps of star-forming gas are shown here in red and orange, representing infrared light emitted by ionised gas, dust grains, and complex molecules such as polycyclic aromatic hydrocarbons (PAHs). Within these gas complexes, each tens or hundreds of light years across, Webb reveals the dense, extremely bright clusters of massive stars that have just recently formed. The countless stars strewn across the arm of the galaxy, many of which would be invisible to our eyes behind layers of dust, are also laid bare in infrared light.
Pic Description[Quad]:
This image shows the four galaxies studied in this research, each of which has previously been the subject of an ESA/Webb Picture of the Month: Messier 51 (top left), Messier 83 (top right), NGC 4449 (bottom left), and NGC 628 (bottom right).
Blue colours, especially in the centre of the galaxies, are near-infrared light that show the location of bright stars. Orange and yellow show ionised gas and red colours come from complex molecules and dust grains; these are longer mid-infrared wavelengths. They trace out the spiral arms of each galaxy as a network of filaments with cavities in between.
Credit:
ESA/Webb, NASA & CSA, A. Pedrini, A. Adamo (Stockholm University) and
the FEAST JWST team.