500-planet-nine-dixon – A hypothetical planet in the outer reaches of the solar system orbits more than 700 times farther from the sun than earth does. A super-Earth, with an estimated mass of 10 Earths (approximately 5,000 times the mass of Pluto), a diameter two to four times that of Earth, and a highly elliptical orbit with an orbital period of approximately 15,000 years, the planet is shown as a ringed ice giant whose night side is illuminated by lightning and aurorae powered by galactic cosmic rays. digital painting, copyright Don Dixon, 2016
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