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Practice Reading: Reading and Writing Fill in the Blanks
ID: #50883
Gravity 2
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Every object pulls on every other object with an force called gravity. This concept was not fully understood until Isaac Newton published the of his three laws of motion. Over 300 years ago, Newton clearly this invisible force of gravity. The strength of the force is determined by distance and mass. For example, the Earth and the Moon each other through gravitational pull, but the Earth exerts a stronger force on the Moon than distant planets like the Jupiter does.
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