A Possible Birthplace for Planetesimals

THE OBSERVATION

What the evidence can show.

Pebble-cloud collapse is a proposed route from small solid particles to planetesimals in a young gas-rich disk. The observed persistence of surface signatures among small Kuiper Belt objects can be compared with such formation ideas. Consistency with a model is not direct observation of the Solar System’s birth. Competing histories must also confront the available color, brightness and dynamical evidence.

THE ILLUSTRATION

What the artwork imagines.

The luminous disk, concentrated particles and developing bodies imagine an inaccessible phase of Solar System history. They are not a snapshot of the Sun’s actual protoplanetary disk or a numerical simulation with specified conditions. The gathering particles represent a possible process, while their appearance and arrangement are invented. The scene does not establish one uniquely confirmed mechanism for every planetesimal.

FOLLOW THE IMAGE INTO THE STORY

The science behind this scene.

What Can the Colors of Tiny Kuiper Belt Objects Tell Us? Small Worlds That Keep Their Colors Pluto & Charon Explorer Explore the worlds beyond the signal 2026 ED138: A World Hidden in the Observing Archive What Does the Rubin Evidence Actually Establish About 2026 ED138? Titan and Pluto: The Same Unidentified Spectral Mark What Is the 5.11-Micrometer Mark on Titan and Pluto? The Man Who Made It To Pluto

Read the illustrated article

Keep looking.

AI-generated artist’s interpretation of an icy Kuiper Belt body beyond Neptune.

An Icy Body Beyond Neptune

AI-generated concept of Webb and Hubble observing faint distant Solar System objects across different wavelengths.

Webb and Hubble Examine Faint Outer Worlds

AI-generated reddish Kuiper Belt surface and stylized spectral comparison, not measured spectra.

The Red Surfaces of Cold Classical Objects