Introduction For S1-3

Our understanding of how things move and why they move has changed greatly over time. For centuries, people thought that the motion of the stars and planets were governed by different laws from those which described the motion of objects on Earth. This way of thinking was changed completely in the 17th century by Isaac Newton. He understood that objects fall to Earth due to the force of gravity, pulling them towards Earth. He also realised that the motion of the planets could be explained using these same laws, and that the reason why the planets orbit the Sun is also because of gravity, with the Sun’s enormous mass exerting a gravitational pull on the planets and causing them to orbit around it. [Read more…]

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