A Titan collision may link Saturn’s tilt, its moon Hyperion and its rings Skip to content Subscribe today Every print subscription comes with full digital access Subscribe Now Menu All Topics Health Humans Anthropology Health & Medicine Archaeology Psychology View All Life Animals Plants Ecosystems Paleontology Neuroscience Genetics Microbes View All Earth Agriculture Climate Oceans Environment View All Physics Materials Science Quantum Physics Particle Physics View All Space Astronomy Planetary Science Cosmology View All Magazine Menu All Stories Multimedia Reviews Puzzles Collections Educator Portal Century of Science Unsung characters Coronavirus Outbreak Newsletters Investors Lab About SN Explores Our Store SIGN IN Donate Home INDEPENDENT JOURNALISM SINCE 1921 SIGN IN Search Open search Close search Home INDEPENDENT JOURNALISM SINCE 1921 All Topics Earth Agriculture Climate Oceans Environment Humans Anthropology Health & Medicine Archaeology Psychology Life Animals Plants Ecosystems Paleontology Neuroscience Genetics Microbes Physics Materials Science Quantum Physics Particle Physics Space Astronomy Planetary Science Cosmology Tech Computing Artificial Intelligence Chemistry Math Science & Society All Topics Health Humans Humans Anthropology Health & Medicine Archaeology Psychology Recent posts in Humans Neuroscience The right sounds may turn sleep into a problem-solving tool By Bethany BrookshireMarch 3, 2026 Health & Medicine Over 40? 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JPL-Caltech/NASA, Space Science Institute By Lisa Grossman 2 hours ago Share this:Share Share via email (Opens in new window) Email Share on Facebook (Opens in new window) Facebook Share on Reddit (Opens in new window) Reddit Share on X (Opens in new window) X Print (Opens in new window) Print Two of Saturn’s satellites — its largest and one of its weirdest — may owe their current forms and orbits to a two-moon pileup about 400 million years ago. A smashup between a doomed moon and the massive moon Titan could have birthed the spongy-looking Hyperion, a study submitted February 9 to arXiv.org suggests. Ensuing chaos in the Saturn system could then have led to the formation of its rings. The notion builds on a 2022 proposal by another team, which suggested the existence of a former moon to solve some long-standing mysteries about the Saturn system, including its relatively high tilt, its youthful rings and the orbital relationships of some of its moons. Sign up for our newsletter We summarize the week's scientific breakthroughs every Thursday. The first clues came from Saturn’s relationship with Neptune. For decades, planetary scientists assumed that Saturn and Neptune had what’s called a spin-orbit resonance: Both Saturn’s spin axis and Neptune’s orbit around the sun seemed to wobble at almost the same rate. But data from NASA’s Cassini mission, which orbited Saturn from 2004 to 2017, showed that Saturn is slightly out of sync with Neptune. Still, the wobble rates are close enough to suggest the planets annulled their resonance relationship relatively recently in cosmic terms — maybe a few hundred million years ago. “That tells us there was some disruption in the outer Saturn system,” says planetary scientist Matija Ćuk of the SETI Institute in Mountain View, Calif. Ćuk and his colleagues suggest this disruption came in two parts. First, a doomed moon collided with Titan, altering Titan’s tug on Saturn’s spin axis enough to break the resonance with Neptune and producing debris that could later coalesce to form Hyperion. That collision might also have left Titan on a more extreme orbit — one that continued to slowly widen over the following few hundred million years. Titan’s orbital evolution eventually could have gravitationally triggered a slow-motion train wreck that led Saturn’s inner moons to collide and grind each other down, ultimately spawning both the rings and a new crop of young inner moons. Previously, MIT planetary scientist Jack Wisdom and colleagues suggested that the break in Saturn-Neptune relationship coincided with the formation of Saturn’s famed rings, which some planetary scientists think are a mere 150 million years old. Wisdom’s team proposed that an extra moon, dubbed Chrysalis, could have tugged on Saturn’s spin axis, breaking the resonance with Neptune, before veering perilously close to the planet and being shredded into the rings. “Jack wanted to tie those two together,” Ćuk says. “But I thought that the formation of Hyperion is a more direct clue.” Based on earlier work, Ćuk calculated that Hyperion must have settled into its current orbital arrangement within the last 400 million years, a timeframe comparable to that of the presumed dissolution of Saturn and Neptune’s resonance. In the new work, Ćuk and his colleagues su
A Titan collision may link Saturn’s tilt, its moon Hyperion and its rings
