Asteroid sample return missions have brought well preserved samples of the early solar system (that hadn’t been roasted in a fireball) back to Earth for the first time. But those samples, like the OSIRIS-REx sample from asteroid (101955) Bennu, sometimes provide more questions than answers. A new paper, published in Science Advances from researchers at ETH Zurich and Lawrence Livermore National Laboratory, highlights one of those questions - why Bennu appears to have been born in both the inner and outer solar system - and a possible answer to it.
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