Explain why most planets in the solar system have nearly circular orbits. Explain why most planets in the solar system have nearly circular orbits. Most planets in the solar system have almost circular orbits due to the gravitational force exerted by the Sun. This force tends to keep the planets on elliptical orbits close to circularity.
But in fact most orbits in the Solar system are. As for the equilibrium argument, entropy suggests that most orbits aren''t circular. There are many more non-circular orbits with the same energy, for the kind of orbits we''re talking about in the solar system (sun-planet distance way bigger than their combined radii).
For a perfectly circular orbit, the eccentricity is 0; with increasing elongation of the orbit’s shape, the eccentricity increases toward a value of 1, the eccentricity of a parabola. Of the eight major planets, Venus and Neptune have the most circular orbits around the Sun, with eccentricities of 0.007 and 0.009, respectively.
As they slowly lose $e$ by scattering and damping events, the mutual interaction will decrease as the orbits become more circular. This would explain why Earths orbit is circular. But in fact most orbits in the Solar system are. As for the equilibrium argument, entropy suggests that most orbits aren''t circular.
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