A mysterious object discovered in the early universe may not be an isolated point of light after all. A new analysis of images of 217 “little red dots” from the NASA/ESA/CSA James Webb Space Telescope suggests they reside within a surprisingly compact star-forming galaxy.
The tiny red dots may reside in small galaxies with a total mass equivalent to about 1 billion times that of our Sun. Image credit: Zhang others., doi: 10.1038/s41550-026-02945-z.
“Little red dots (LRDs) are small red celestial bodies that can be seen far away from Earth,” astronomer Xu Hengding of Wuhan University and colleagues said in a statement.
“However, the nature of LRD and its light source remain unclear.”
“Previous studies have found signs of matter at ultraviolet wavelengths around some of these objects, possibly indicating the presence of galaxies.”
“But in optical light (light that the human eye can see), which allows us to see the star’s mass more clearly, there is little evidence of this material.”
In this study, astronomers performed an image stacking analysis of 217 LRDs and detected faint extended emission around these objects.
Modeling of the data shows that this radiation likely comes from star-forming galaxies, at whose centers the LRD resides as supermassive black holes.
These galaxies have an average radius of only 685 light-years, making them about 2.5 times more compact than other star-forming galaxies of similar mass observed during the same period of the universe’s history.
This finding suggests that LRDs are likely to exist within compact star-forming galaxies rather than just single points of light, which helps explain their origin.
“This study provides direct observational evidence for the existence of LRD host galaxies at rest-system optical wavelengths and provides new insights into the accumulation of stars in these systems within the first billion years after the Big Bang,” the researchers said.
their paper Published in the Journal on August 24, 2026 natural astronomy.
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Y. Chan others. Small red dot extension component of rest frame optics. Nat Astronpublished online on August 24, 2026. doi: 10.1038/s41550-026-02945-z
Source: www.sci.news
