The mysterious objects spotted in the early Universe may not be isolated points 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 sit inside remarkably compact, star-forming galaxies.
Little red dots may reside in small galaxies with total masses equivalent to around one billion times that of the Sun. Image credit: Zhang et al., doi: 10.1038/s41550-026-02945-z.
“Little red dots (LRDs) are small, red objects seen at far distances from Earth,” Wuhan University astronomer Xuheng Ding and colleagues said in a statement.
“However, the nature of LRDs and the source of their light remains unclear.”
“Previous research has found signs of material around some of these objects at ultraviolet wavelengths, possibly indicating the presence of galaxies.”
“However, there has been little evidence of this material in optical light (light that human eyes can see), which gives a clearer view of stellar mass.”
In the study, the astronomers performed an image stacking analysis of 217 LRDs and detected faint extended emission around these objects.
Modelling of the data indicates that this emission likely comes from star-forming galaxies, with LRDs residing in their centers as supermassive black holes.
The galaxies have average radii of just 685 light-years, making them about 2.5 times more compact than other star-forming galaxies of a similar mass seen at a comparable period in the Universe’s history.
The findings suggest that LRDs are not simply single points of light but likely exist within compact star-forming galaxies, which helps to explain their origin.
“This work provides direct observational evidence for the existence of LRD host galaxies at rest-frame optical wavelengths and offers new insights into the stellar buildup of these systems within the first billion years after the Big Bang,” the researchers said.
Their paper was published August 24, 2026 in the journal Nature Astronomy.
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Y. Zhang et al. Extended components of little red dots in the rest-frame optical. Nat Astron, published online August 24, 2026; doi: 10.1038/s41550-026-02945-z
