Astronomy
- Hydra (constellation), the largest of the modern star constellations
- Hydra (moon), a satellite of Pluto
Read more about this topic: Hydra
Famous quotes containing the word astronomy:
“It is noticed, that the consideration of the great periods and spaces of astronomy induces a dignity of mind, and an indifference to death.”
—Ralph Waldo Emerson (1803–1882)