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May 23, 2017 at 6:22 comment added HopDavid The orbits Pluto and Charon have about their barycenter have eccentricities very close to zero, also a product of tidal evolution as is their mutual tide locking. Thanks for the link. It is good to hear Henry Spencer's voice.
May 22, 2017 at 17:37 comment added user To put that eccentricity figure in perspective, Earth's orbit around the Sun has an eccentricity of approximately 0.0167, and Mars' corresponding value is 0.0934.
May 22, 2017 at 10:53 history answered pablodf76 CC BY-SA 3.0