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Hydra, in astronomy

(Encyclopedia)Hydra, in astronomy, southern constellation lying S of Corvus, Crater, Virgo, Leo, and Cancer. It is a long, slender, winding constellation traditionally depicted as a snake and known also as the Wate...

hydra, in zoology

(Encyclopedia)hydra hīˈdrə [key], common name for freshwater organisms in the phylum Cnidaria, which includes jellyfish, sea anemones, and corals. Hydras are widely distributed in lakes, ponds, and sluggish stre...

Hydra, in Greek mythology

(Encyclopedia)Hydra, in Greek mythology, many-headed water serpent; offspring of Typhon and Echidna. When one of its heads was cut off, two new heads appeared. The second labor of Hercules was to kill the monster. ...

Hydra, island, Greece

(Encyclopedia)Hydra, Greece: see Ídhra.

Pluto, in astronomy

(Encyclopedia)Pluto, in astronomy, a dwarf planet and the first Kuiper belt, or transneptunian, object (see comet) to be discovered (1930) by astronomers. Pluto has an elliptical orbit usually lying beyond that of ...

coma, in astronomy

(Encyclopedia)coma, in astronomy: see comet.

Eros, in astronomy

(Encyclopedia)Eros, in astronomy: see asteroid. ...

Hermes, in astronomy

(Encyclopedia)Hermes, in astronomy: see asteroid. ...

Icarus, in astronomy

(Encyclopedia)Icarus, in astronomy: see asteroid. ...

Charon, in astronomy

(Encyclopedia)Charon, in astronomy, the natural satellite, or moon, of Pluto. ...