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Albinos
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PDA
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Convergent evolution
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Breadfruit
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Holoside
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Internal combustion hydrogen engine
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Plum
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Kepler's first law
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New Horizons
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Nanoparticle
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Saffir-Simpson Scale
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Antispastic agent
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GEOSS
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European corn borer
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Pillow lavas
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Fluid inclusion
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HCFC
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Supplementary service
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Launch centre
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Rillwash
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Bamako Convention
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Sea ice
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Ductule
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Worm
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Vasectomy
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2.5 G
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Cheiropompholyx
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Pyelo-ureteric junction
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Cholestasis
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Grapefruit
Hydra
Hydra is the familiar name of Pluto's moon S/2005 P 2 discovered in May 2005 by the Hubble space telescope. It is named after the Hydra of Greek mythology, a nine-headed creature slain by Hercules.
The Pluto system with its three moons, Charon, the closest, Nix and Hydra, the furthest.
(Credits: NASA / STScI)
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