Michigan State University Simulation Explains Gravitational Origins of Snowman Shaped Objects in Kuiper Belt

New Michigan State University research shows how gravity naturally creates the snowman shaped icy bodies found in the outer solar system.

By: AXL Media

Published: Feb 23, 2026, 10:22 AM EST

Source: The information in this article was sourced from ScienceDaily - https://www.sciencedaily.com/releases/2026/02/260222085206.htm

Recreating the Frozen Architecture of the Distant Kuiper Belt

The mystery of why numerous icy bodies in the furthest reaches of our solar system resemble snowmen has finally met a plausible scientific explanation. Beyond the orbit of Neptune lies the Kuiper Belt, a vast region populated by frozen remnants from the earliest days of our planetary system. These primitive objects, known as planetesimals, serve as the original building blocks that failed to coalesce into larger planets. Observations have long shown that approximately one in ten of these bodies are contact binaries, meaning they consist of two distinct rounded lobes joined together. This specific structural pattern has puzzled astronomers for decades, as the delicate nature of these connections suggested they could not have survived the high energy impacts typical of early solar system development.

Overcoming Traditional Fluid Models Through Advanced Computational Simulation

To address this mechanical riddle, Jackson Barnes, a graduate student at Michigan State University, developed a groundbreaking computer simulation that prioritized structural integrity. Previous models often simplified celestial impacts by treating colliding bodies as if they were fluid masses, which inevitably resulted in the two objects merging into a single smooth sphere. According to Barnes, this fluid assumption prevented researchers from accurately recreating the unique two part shapes observed in the field. By utilizing the high performance computing cluster at MSU’s Institute for Cyber-Enabled Research, Barnes was able to create a more realistic digital environment where forming objects retained their solid characteristics, allowing them to settle against one another without losing their individual identities.

Validating the Prevalence of Double Lobed Structures via Gravity

The results of the simulation point toward a surprisingly straightforward process governed by gravitational forces. According to Earth and Environmental Science Professor Seth Jacobson, the senior author of the paper, the formation of these contact binaries is a natural consequence of gravitational collapse. The model shows that as rotating clouds of dust and ice collapse under their own weight, they often split into two separate bodies that begin to orbit a common center. Instead of colliding with enough force to cause destruction, these pairs...