Bennu samples reveal Jupiter's role in shaping the early Solar System

Analysis of asteroid material challenges theories about birthplace and formation

By LineZotpaper AI staff

Published24 October 2026

Read Time2 min

Samples collected from asteroid Bennu by NASA's OSIRIS-REx mission have revealed surprising new details about the formation of the Solar System, challenging assumptions about the asteroid's origin and suggesting Jupiter played a key role in mixing materials from the inner and outer Solar System nearly 4.5 billion years ago.

Researchers at ETH Zurich, led by Professor Maria Schönbächler, have published a chemical analysis of material from asteroid Bennu in Science Advances that identifies a distinctive isotopic fingerprint in iron, titanium, and chromium. The analysis shows that Bennu, the asteroid Ryugu, and a rare group of primitive meteorites called CI meteorites share strikingly similar isotopic patterns, indicating they formed from the same reservoir of ancient cosmic dust.

Contrary to earlier theories that primitive asteroids like Bennu originated in the outer Solar System, the new findings propose that Bennu's parent material accumulated near the water-ice line, a boundary in the young Sun's disk where water vapor could freeze into ice. Dust from both inner and outer regions mixed at this boundary, with water ice helping particles stick together to form larger bodies. "Bennu is a hybrid: the material does not clearly match either the inner or the outer Solar System," Schönbächler said.

The study also suggests that Jupiter played a crucial role in this process. Forming within about one million years of the Sun's birth, the gas giant's rapid growth and immense gravity are thought to have acted as a barrier that prevented larger particles from crossing its orbital path while allowing fine dust to circulate freely and mix near the water-ice line. This mixing produced material that retains a chemical composition close to that of the Sun.

Bennu's water-bearing minerals and organic compounds make it valuable for understanding how Earth obtained the ingredients necessary for life. "Bennu may offer our best glimpse of the original mix of chemical elements from which the terrestrial planets were ultimately built," Schönbächler said.

NASA's OSIRIS-REx mission delivered approximately 120 grams of asteroid material to Earth on September 23, 2023, when a capsule landed in the Utah desert. The ETH Zurich laboratory received half a gram for analysis.

Analysis

Why This Matters

The findings reshape understanding of how the Solar System's building blocks were distributed, offering clues about where Earth's water and organic compounds originated.
Jupiter's role as a mixing agent implies that giant planets can influence the composition of smaller bodies, a process likely common in other planetary systems.
Bennu's primitive material provides a direct sample of the early Solar System, helping to reconstruct conditions before the planets finished forming.

Background

Asteroid Bennu is a carbon-rich, primitive asteroid that has undergone little chemical alteration since its formation about 4.5 billion years ago. NASA's OSIRIS-REx mission collected samples from its surface and returned them to Earth in 2023, making Bennu one of the most studied objects from the early Solar System. Scientists have long debated the origins of such asteroids, with many assuming they formed in the outer Solar System alongside comets. The new analysis challenges that view, proposing formation near the water-ice line with material mixed from both inner and outer regions.

Key Perspectives

ETH Zurich researchers (Professor Maria Schönbächler): Bennu's material is a hybrid of inner and outer Solar System components, mixed near the water-ice line with Jupiter's gravity facilitating the process. The asteroid's chemical fingerprint closely resembles CI meteorites and Ryugu, suggesting a common source region.

What to Watch

Further analyses of Bennu samples by other research teams may confirm or refine the proposed formation scenario, including the timing of Jupiter's growth.
Upcoming missions to other primitive bodies, such as a planned mission to Mars's moon, could test whether similar mixing processes occurred elsewhere in the Solar System.
Continued study of Bennu's organic compounds may yield additional evidence about the chemical precursors to life on Earth.

Sources

NASA’s asteroid Bennu samples reveal a 4.5-billion-year-old secret · ScienceDaily

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12 claims in this story checked against 1 source: 9 supported.

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SupportedThe headline says Bennu samples reveal Jupiter’s role in shaping the early Solar System.Latest Science News -- ScienceDaily: “Asteroid Bennu is revealing surprising secrets about Jupiter's role in shaping the early Solar System”
SupportedThe summary says the analysis challenges theories about Bennu’s birthplace and formation.Latest Science News -- ScienceDaily: “A new chemical analysis challenges earlier theories about the asteroid's birthplace and suggests that Jupiter played an important role in shaping the materials from which Bennu and other ancient objects formed.”
SupportedSchönbächler said: “Bennu is a hybrid: the material does not clearly match either the inner or the outer Solar System.”Latest Science News -- ScienceDaily: “"Bennu is a hybrid: the material does not clearly match either the inner or the outer Solar System," says Schönbächler.”
SupportedSchönbächler said: “Bennu may offer our best glimpse of the original mix of chemical elements from which the terrestrial planets were ultimately built.”Latest Science News -- ScienceDaily: “"Bennu may offer our best glimpse of the original mix of chemical elements from which the terrestrial planets were ultimately built," as Schönbächler states.”
SupportedThe researchers examined isotopes of iron, titanium and chromium in Bennu material.Latest Science News -- ScienceDaily: “To investigate Bennu's origins, the ETH Zurich researchers examined isotopes of three elements: iron, titanium, and chromium.”
SupportedBennu, Ryugu and CI meteorites share similar isotopic fingerprints, suggesting their materials came from the same reservoir of ancient cosmic dust.Latest Science News -- ScienceDaily: “Bennu, Ryugu, and CI meteorites share strikingly similar isotopic fingerprints, suggesting that their original materials came from the same reservoir of ancient cosmic dust.”
SupportedThe researchers propose that material that became Bennu accumulated near the water-ice line, where dust from inner and outer regions mixed and water ice helped particles stick together.Latest Science News -- ScienceDaily: “Dust originating in both the inner and outer regions mixed near this boundary. Water ice helped the smallest particles stick together, allowing them to gradually accumulate into larger bodies.”
SupportedJupiter began forming within about one million years of the Sun’s birth.Latest Science News -- ScienceDaily: “Jupiter began forming extraordinarily early in Solar System history, within approximately one million years of the Sun's birth.”
Partly supportedJupiter’s gravity prevented larger particles from crossing its orbital path while allowing fine dust to circulate freely and mix near the water-ice line.Latest Science News -- ScienceDaily: “The researchers suggest that the growing gas giant acted somewhat like a structural barrier, preventing most larger particles from crossing its orbital region while still allowing finer dust to move around it.”
Partly supportedThe mixing produced material with a chemical composition close to the Sun’s.Latest Science News -- ScienceDaily: “Because these tiny particles could circulate and mix efficiently throughout the disk, they preserved a chemical composition that closely resembles the overall elemental mixture found in the Sun.”
Partly supportedBennu’s water-bearing minerals and organic compounds make it valuable for understanding how early Earth obtained ingredients necessary for life.Latest Science News -- ScienceDaily: “Bennu's water-bearing minerals and organic compounds also make it important for investigating how early Earth obtained some of the chemical ingredients necessary for life.”
SupportedA capsule carrying approximately 120 grams of asteroid material landed in Utah on September 23, 2023.Latest Science News -- ScienceDaily: “On September 23, 2023, a capsule carrying approximately 120 grams of asteroid material landed in the Utah desert.”