Geocentric and Heliocentric Systems

Science, Grade 9

Geocentric and Heliocentric Systems

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1. Geocentric and Heliocentric Systems
Our solar system includes the Sun, eight planets, the moons of each planet and other objects that revolve around the Sun. The four rocky planets closest to the Sun are known as the inner planets, and the four gaseous planets in the outer solar system are called the outer planets. The relative size of the inner planets is much smaller than the outer planets.