Ω OMEGA SCIENCE NEWS

Daily Discovery • September 9, 2026

Some of the smallest worlds in our solar system may still carry clues to its beginnings.

[T — Reported finding] In a September 8 report, NASA described coordinated Hubble and James Webb observations of 27 newly discovered objects beyond Neptune. The smallest observed is approximately five kilometers—three miles—across.

These distant, icy bodies are remnants of the era when planets were assembling. Hubble measured visible light while Webb observed infrared light, allowing researchers to investigate their properties together.

THE SURPRISE

[T — Reported finding] The small objects showed color relationships resembling those of larger objects in their populations. Researchers also found fewer very small bodies than some models predicted.

[I — Interpretation] Their surfaces may preserve chemical clues from their formation despite billions of years of history.

[U — Unresolved] Why have collisions not changed those surface signatures more? Fewer collisions or the survival of original material are possible explanations. The answer remains open.

WHY IT MATTERS

These tiny worlds give scientists another way to test how planetary building blocks formed. Their faint light carries evidence we can examine from an extraordinary distance.

Read the original report:

"NASA: Hubble and Webb investigate distant solar-system objects" (https://science.nasa.gov/missions/hubble/nasas-hubble-webb-find-far-out-solar-system-objects-remember-past/)