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Asynchronous
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Antimatter
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Hallux
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Fibrous root system
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IAM
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Oncology
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Interstellar cloud
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Botulism
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Launch centre
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Giant sequoia
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Influenza A
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DAC
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Endocytosis
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Photochemical pollution
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Pharynx
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PLED
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Homotopy
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Stoma
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Roof drain
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Amyotrophy
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Fibrate
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Interface
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Water Framework Directive
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Windows 7
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Sundancer
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Handkerchief tree
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Intestinal flora
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Crinoids
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Translocation
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Supergalactic coordinate
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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