NASA’s asteroid Bennu samples reveal a 4.5-billion-year-old secret
Tiny samples from asteroid Bennu are rewriting scientists' understanding of how our Solar System formed. New evidence suggests that Bennu was born where material from the inner and outer Solar System mixed, with Jupiter playing a surprising role in shaping its formation.
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- The Role of Jupiter as a 'Structural Barrier': Rather than just a massive planet, Jupiter acted as a dynamic structural barrier in the early protoplanetary disk. By rapidly accumulating mass within one million years of the Sun's birth, its gravity restricted the movement of larger particles while allowing finer dust to migrate and mix near the water-ice line.
- Isotopic Evidence for a Hybrid Origin: The chemical analysis of iron, titanium, and chromium isotopes reveals that Bennu is not a purely 'outer' or 'inner' body but a hybrid. Its isotopic 'fingerprint' closely matches that of the asteroid Ryugu and rare CI meteorites, suggesting these objects share a common reservoir of ancient cosmic dust that accumulated at the water-ice boundary 4.5 billion years ago.
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