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  • Diagram demonstrating Newton’s orbital cannon theory.
    Rights: Department of Physics & Astronomy, University of Tennessee, Knoxville. Published 27 March 2013 Size: 37 KB Referencing Hub media

    Newton reasoned that, if the cannon ball was fired with exactly the right velocity, the ball would travel completely around the Earth, always falling in the gravitational field but never reaching the Earth, which is curving away at the same rate that the projectile falls. It would be placed in orbit around the Earth.

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