n. the apparent surface of the imaginary sphere on which celestial bodies appear to be projected

n. everything that exists anywhere; "they study the evolution of the universe"; "the biggest tree in existence"

n. (astronomy) a collection of star systems; any of the billions of systems each having many stars and nebulae and dust; "`extragalactic nebula' is a former name for `galaxy'"

n. the line at which the sky and Earth appear to meet

n. a line determining the limits of an area

n. the quality of being a competitive advantage

n. the solid part of the earth's surface; "the plane turned away from the sea and moved back over land"; "the earth shook for several minutes"; "he dropped the logs on the ground"

n. (astronomy) any of the nine large celestial bodies in the solar system that revolve around the sun and shine by reflected light; Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto in order of their proximity to the sun; viewed from the constellation Hercules, all the planets rotate around the sun in a counterclockwise direction

n. any spherically shaped artifact