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100 Greatest Discoveries in Science Video Guide - Astronomy

100 Greatest Discoveries in Science Video Guide - Astronomy The Planets Move (2000 B.C. – 500 B.C.) A thousand years of observations reveal that there are stars that move in the sky and follow patterns, showing that the Earth is part of a solar system of planets separate from the fixed stars. 1. Why is the Venus tablet of Amozogania important?