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To get a circular orbit, the speed of the plantets differs for each radius. According to the formula: v=√Gm/r In this formula v is the velocity for a circular orbit, G is the gravivitional constant (6.67x10-11 mkg-1 s-2), m the mass of the star (the masses of the planets are regard to be neglectable with respect to the mass of the star) and r the distance from the planet to the star.

Previous: Kepler. Next: Velocities 2.

See also: Orrery, The sky at night.

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