NASA的OSIRIS-REx任务采集的小行星贝努样本经过同位素分析，揭示了太阳系早期的一段重要历史。1样本于2023年9月23日在犹他州沙漠着陆，装有约120克小行星物质。1研究团队通过检测铁、钛和铬三种元素的同位素，发现贝努由混合自太阳系内外部的物质组成，形成于冰水线附近，距今约45亿年。1
苏黎世联邦理工学院的研究表明，贝努的这一独特成分很可能源于木星的早期形成与引力作用。1木星在太阳系形成约100万年内就已开始形成，其引力可能促进了太阳系内外部物质的混合过程，从而影响了贝努及其他原始小行星的成分。1贝努、龙宫小行星和CI型陨石具有相似的同位素指纹，进一步支持了这一发现。1该研究已发表在《Science Advances》杂志2026年第12卷第39期。1
Samples collected by NASA's OSIRIS-REx mission from asteroid Bennu have provided new insights into the early solar system's composition and dynamics. The return capsule, carrying approximately 120 grams of material from the asteroid, landed in the Utah desert on September 23, 2023.1 Through isotopic analysis of iron, titanium, and chromium, researchers discovered that Bennu's composition matches the isotopic signatures found in asteroid Ryugu and CI meteorites.1
According to research from ETH Zurich, the isotopic evidence reveals that Bennu formed roughly 4.5 billion years ago from a mixture of materials originating from both the inner and outer regions of the solar system, near the snowline.1 Scientists propose that Jupiter's early formation within the first million years of the solar system's development may have driven this mixing process through gravitational interactions, ultimately influencing the composition of Bennu and other primitive asteroids.1 The findings were published in Science Advances, volume 12, issue 39, in 2026.1
Japan's JAXA space agency plans to launch its own sample return mission from Phobos in late October 2026, with samples expected to return to Earth in 2031.1
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