The Moon's current orbit is at odds with theories predicting that its early orbit was in Earth's equatorial plane. Simulations now suggest that its orbit was tilted by gravitational interactions with a few large bodies. See Letter p.492
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Canup, R. The Moon's tilt for gold. Nature 527, 455–456 (2015). https://doi.org/10.1038/527455a
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DOI: https://doi.org/10.1038/527455a