atmosphere, air - the mass of air surrounding the Earth; "there was great heat as the comet entered the atmosphere"; "it was exposed to the air"

hemisphere - half of the terrestrial globe

Van Allen belt - a belt of charged particles (resulting from cosmic rays) above the Earth trapped by the Earth's magnetic field

hydrosphere - the watery layer of the earth's surface; includes water vapor

dry land, ground, solid ground, terra firma, land, earth - 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"

geosphere, lithosphere - the solid part of the earth consisting of the crust and outer mantle

sky - the atmosphere and outer space as viewed from the earth

solar system - the sun with the celestial bodies that revolve around it in its gravitational field

terrestrial planet - a planet having a compact rocky surface like the Earth's; the four innermost planets in the solar system

crystal ball - a glass or crystal globe used in crystal gazing by fortunetellers

camphor ball, mothball - a small sphere of camphor or naphthalene used to keep moths away from stored clothing

time-ball - a ball that slides down a staff to show a fixed time; especially at an observatory

fireball - the luminous center of a nuclear explosion

fireball - a ball of fire (such as the sun or a ball-shaped discharge of lightning)

globule - a small globe or ball

sphere - a solid figure bounded by a spherical surface (including the space it encloses)

spherule - a small sphere

pellet - a small sphere

bolus - a small round soft mass (as of chewed food)

celestial globe - a globe that is a spherical model of the heavens

simulation, model - representation of something (sometimes on a smaller scale)

sphere - any spherically shaped artifact