| 31. | Instead of thinking about circular orbits, think of the way things fall back to earth.
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| 32. | Suppose you have two equal masses that are rotating about each other in circular orbits.
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| 33. | Both the inner and outer planets should have almost circular orbits in the same plane.
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| 34. | The planet orbits the star every 10 days 17 hours in a very circular orbit.
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| 35. | Thus our existence depends on both Jupiter and Earth being in mutually stable, circular orbits.
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| 36. | It is known that in the past, Mars has had a much more circular orbit.
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| 37. | Just take the simplest case, that of a planet on circular orbit around a star.
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| 38. | While the other planets travel in circular orbits, Pluto's orbit is a peculiarly tilted ellipse.
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| 39. | So this is how you get perfectly circular orbits.
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| 40. | Circular orbits are a particular solution of the equation.
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