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Very little is known about the Moons of Pluto - as too Pluto.

Although neither have been directly measured, at the time of discovery Hydra was 25% brighter than Nix.

Nix has an estimated radius of 23 −> 68 km whereas Hydra has an estimated radius of 30 −> 84 km

Hydra is bigger but by a very small amount.

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15y ago

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