Webb and Hubble find dozens of tiny Kuiper Belt objects
Using deep infrared images from the James Webb Space Telescope and optical follow‑up from the Hubble Space Telescope, astronomers identified 27 new trans‑Neptunian objects, some about six miles wide, and measured their surface colors and rotation behavior. The size distribution shows only a slight rise in the smallest objects, implying most Kuiper Belt mass is concentrated in roughly 120 mile bodies and supporting a rapid "born big" formation scenario for planetesimals. Two orbital families share the same size pattern and small objects retain reddish surfaces, suggesting limited collisional reshaping and preserved primordial composition.
Most Kuiper Belt mass is in about 120 mile objects
Context
Webb took deep images and found 27 new small trans‑Neptunian objects. Hubble then measured their colors and rotations. Further surveys could test whether even smaller objects exist or refine formation models.
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