The shape of a planet's orbit is one of its fundamental properties, along with its size and distance from its host star. Earth has a nearly circular orbit, but some planets outside our solar system, ...
Launius, Roger D., editor. 2013. Exploring the Solar System: The History and Science of Planetary Exploration. New York, NY: Palgrave Macmillan. In Palgrave Studies in the History of Science and ...
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