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— Konstantin Tsiolkovsky"Man must at all costs overcome the Earth's gravity and have, in reserve, the space at least of the Solar System."
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Bodies like the earth are not made to move on curved orbits by a force called gravity; instead, they follow the nearest thing to a straight path in a curved space, which is called a geodesic. A geodesic is the shortest (or longest) path between two nearby points.
— Stephen Hawking
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You sometimes speak of gravity as essential and inherent to matter. Pray do not ascribe that notion to me, for the cause of gravity is what I do not pretend to know, and therefore would take more time to consider of it.
— Isaac Newton
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