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Newton's 1st law of motion states that a moving object will go in a straight line unless an outside force changes this motion. what outside force prevents the planets from moving in a straight line into space?

User CrazyYoshi
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All objects in space (and everywhere else!) pull each other. This is called gravity. The reason things don't travel in a straight line through space is because everything is pulling each other with gravity.
User Mantu Nigam
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Gravity holds the planets in their orbits. 
User Karu
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