Measuring the size of a small, frost world

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Pluto-Charon system (artistacutes impression) (Credit: ESO)
Pluto-Charon system (artist's impression) (Credit: ESO)

Being in the right place at the right time gave a group of Massachusetts research astronomers a unique opportunity to study Pluto's largest moon Charon. The resulting measurements, to unprecedented accuracy, of Charon's size and possible atmosphere provide insight into the way this distant world may have formed.


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