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Planetary science

The ferryman casts his shadow

The most accurate way of determining the size of some bodies in the Solar System is to observe them as they pass across the face of a star. In the case of Charon, Pluto's largest satellite, it's been a long wait.

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Tholen, D. The ferryman casts his shadow. Nature 439, 24–25 (2006). https://doi.org/10.1038/439024a

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