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Space Vocab

TermDefinition
Rotation The spin of an object in space
Revolution The elliptical motion of a body as it travels around another more massive body in space
Orbit The elliptical PATH an object takes in space while revolving around another object
Gravity Attracting force due to mass or rotation
Atmosphere Mixture of gases that surrounds a planet
Sun A medium sized star; the center of our solar system
Planet Body that orbit around the sun or a star and does not produce its own light
Terrestrial Planet A small, dense, rocky planet similar to Earth (Inner planets)
Gas Giant A large, gaseous planet of the outer solar system with no known solid surface (Outer planets)
Natural Satellite Smaller body that orbits around a larger body
Moon A natural satellite of a planet
Artificial Satellite Any human made object placed in orbit around a body in space
Comet A small body of ice, rock, and cosmic dust loosely packed together
Asteroid A small, rocky body that revolves around the sun
Meteoroid A very small, rocky body found in space
Meteorite A meteoroid that reaches Earth’s surface without burning up completely
Meteor A bright streak of light caused when a meteoroid or comet dust burns up in the atmosphere
Thrust The force that accelerates a rocket
Orbital Velocity The speed and direction a rocket must have in order to orbit Earth
Escape Velocity The speed and direction a rocket must have in order to completely break away from a planet’s gravitational pull
Centripetal Force The force that causes an object to follow a curved path
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