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Geocentric Perspective

the perspective of the universe focusing on the Earth as the center of the universe

Heliocentric Perspective

the perspective of the solar system focusing on the Sun as the center.


a large system of dust, gas, and stars that has a particular shape

Astronomical Unit (AU)

the unit of measure equal to the Earth's distance from the Sun. The Earth is 1 AU (150 million km) from the Sun.


the study of the stars, planets, and other objects in space.


the spinning of an object around a central axis.


the orbiting of one object around another

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