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The Solar System!

Vocabulary That is Out of This World!

TermDefinition
Star A huge burning sphere of gases, for example the sun.
Solar System A group of objects in space that move around a central star.
Rotation The motion of an object as it turns on its axis.
Axis An imaginary line that runs through both poles of a planet.
Revolution The movement of any object in orbit, such as Earth moving around the sun.
Phases One of the different shapes the moon seems to have as it orbits around the Earth.
Orbit The path that an object such as a planet takes as it revolves around a second object.
Satellite A natural body, like the moon or an artificial object that orbits another object.
Space Probe A robot vehicle used to explore deep space.
Telescope An instrument that magnifies distant objects or makes them appear larger.
Gas Giants Another name for planets that are made up of mostly gases.
Outer Planets Jupiter, Saturn, Uranus, and Neptune are large spheres made up mostly of gases.
Inner Planets Mercury, Venus, Earth, and Mars lie between the sun and the asteroid belt.
Comet Balls of ice and rock that circle the sun from two regions beyond the orbit of Pluto.
Asteroid Chunks of rock that look like potatoes.
Planet A large, round body that revolves around a star.
What is a natural satellite of Earth? The Moon.
How long does it take the moon to complete one orbit around Earth? 29 days.
How much of the moon is always li by the sun? 1/2 of the moon.
Waxing The amount of the moon that we are able to see increasing.
Waning The amount of the moon that we are able to see decreasing.
Created by: mjys02
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