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Universe Space and all the matter and energy in it.
Light-Year The distant that travels in one year; About 9.46 trillion kilometers.
Solar System The sun and all of the planets and other bodies that travel around it.
Galaxy A collection of stars,dust and gas bound together by gravity.
Planet A relatively large spherical body that obits a star.
Star A large celestial body that is composed of gas and that emits light; The sun is a typical star.
Astronomical-Unit A large distance between Earth and sun; Approximately 150 million kilometers symbol,AU
Created by: 4804076413