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The inner solar system's biggest and most recent known collision was the Moon-forming giant impact between a large protoplanet and proto-Earth. Not only did it create a disk near Earth that formed the Moon, it also ejected several percent of an Earth mass out of the Earth-Moon system. Here, we argue that numerous kilometer-sized ejecta fragments from that(More)
Symplectic integrators have been the backbone of much theoretical solar system research over the past decade. As implemented, they involve the direct computation of the distances between each pair of N particles, a process whose effort grows as O(N 2). A variety of fast [that is, with effort growing more slowly than O(N 2)] but approximate force calculation(More)
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