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Grade 4 D-3 Sci. Def

Chapter 3 Planets and Other Objects in Space

TermDefinition
Satellite An object that moves around another object in space; the moon is a satellite of Earth
Orbit The path that an object such as a planet makes as it revolves around a second object
Phase One of the different shapes the moon seems to have as it orbits around Earth
Revolution The movement of any object in an orbit, such as Earth moving around the sun
Axis An imaginary line that runs through both poles of a planet
Rotation The motion of a planet or other object as it turns on its axis
Solar system A group of objects in space that move around a central star
Star A huge, burning sphere of gases; for example, the sun
Planet A large object that moves around a star
Asteroid A small rocky object that moves around the sun
Comet A small mass of dust and ice that orbits the sun in a long, oval-shaped path
Inner planets The planets closest to the sun; Mercury, Venus, Earth, and Mars
Outer planets The planets farthest from the sun; Jupiter, Saturn, Uranus, Neptune, and Pluto
Gas giants The planets Jupiter, Saturn, Uranus, and Neptune; which are large spheres made up mostly of gases
Telescope A device people use to observe distant objects with their eyes
Space probe A space vehicle that carries cameras, instruments, and other research tools
Created by: scscolts
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