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Hydra is the largest of the 88 modern constellations, and was also one of the 48 constellations listed by Ptolemy. It should not be confused with Hydrus.

Despite its size, Hydra contains only one reasonably bright star (Alphard, α Hya). It also contains the radio source Hydra A.

The 88 modern Constellations

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Topics: Hydra (constellation), Hydra (biology), Hydraulic Ram...

Hydra (biology)Hydra americana Hydra attenuata Hydra canadensis Hydra carnea Hydra cauliculata Hydra circumcincta Hydra hymanae Hydra littoralis Hydra magnipapillata Hydra minima Hydra oligactis Hydra oregona Hydra pseudoligactis Hydra rutgerensis Hydra utahensis Hydra	Hydraulic ramThe use of the term hydraulic ram below describes a type of water pump. For the use of the term in vehicle extrication, see Jaws of Life. A hydraulic ram is a water-powered cyclic pump. It harnesses the " water hammer" effect to pump a portion of the wate	Hydra 70The Hydra 70 rocket is a weapon derived from the 2. 75 inch (70 mm) "Folding-Fin Aerial Rocket" (FFAR) developed by the US Navy for use as a free-flight aerial rocket in the late 1940s. Overview It was originally used during the Korean and Vietnam wars, b
Hydraulic fillA hydraulic fill is an embankment or other fill in which the materials are deposited in place by a flowing stream of water, with the deposition being selective. Gravity, coupled with velocity control, is used to effect the selected deposition of the mater	HydrateHydrates are compounds formed by the union of water with some other substance, generally forming a neutral body, as certain crystallized salts. If the water is heavy water, where the hydrogen consists of the isotope deuterium, then the term deuterate may	HydraulicsHydraulics is a branch of science and engineering concerned with the use of liquids to perform mechanical tasks. It is part of the more general discipline of fluid power. The word "hydraulics" comes from the Greek word hydraulikos which in turn comes from
Hydrazine	Hydra, Saronic Islands	Hydrangea
Hydration	Hydraulics demonstration	Hydraulic despotism
Hydra (constellation)	Hydration reaction	Hydraulic fluid

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