Why some objects in space look like snowmen: Gravitational collapse may shed light on contact binaries
Phys.org
February 19, 2026
AI-Generated Deep Dive Summary
For decades, astronomers have puzzled over why so many icy objects in the outer solar system resemble snowmen. Michigan State University researchers have uncovered evidence suggesting a surprisingly simple explanation: gravitational collapse and contact binaries. This process occurs when two or more celestial bodies collide or come into close contact, reshaping their original forms into rounded, connected structures resembling snowmen. By studying these phenomena, scientists can gain deeper insights into the formation of planetary bodies and the dynamics of gravitational interactions in space.
Contact binaries are pairs of objects that orbit each other so closely they appear to form a single body with two distinct lobes, often resembling snowmen. The researchers propose that this shape arises naturally when smaller fragments within an icy region coalesce under gravity. For example, Pluto’s moon Charon and the comet 67P/Churyumov-Gerasimenko both exhibit similar features, supporting the idea that gravitational collapse plays a key role in shaping these unique formations.
Understanding the forces behind snowman-like objects is crucial for unraveling the history of our solar system. These findings not only explain the origins of peculiar shapes but also provide clues about how planetary bodies might have formed and evolved over billions of years. By studying these processes, scientists can better understand the dynamics of celestial collisions and the role gravity plays in shaping the universe.
This research highlights the importance of gravitational collapse as a fundamental process in astrophysics. It not only answers longstanding questions about icy objects but also opens new avenues for exploring how similar mechanisms might influence other planetary systems or even exoplanets. For science enthusiasts, this discovery offers a fascinating glimpse into the forces that shape our cosmic neighborhood and beyond.
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Originally published on Phys.org on 2/19/2026