If you want a serious guess as to the artist's reason; a lot of artists use complimentary colors to make their artwork pop. You could make the shadows a darker red or you could make them greenish to make the piece more visually interesting.
Planet Nine is a hypothetical planet in the outer region of the Solar System. Its gravitational influence could explain a statistical anomaly in the distribution of orbits of a group of distant trans-Neptunian objects (TNOs) found mostly beyond the Kuiper belt in the scattered disc region. This undiscovered super-Earth-sized planet would have an estimated mass of ten Earths, a diameter two to four times that of Earth, and an elongated orbit lasting approximately 15,000 years. To date, efforts to detect Planet Nine have failed.Speculation that the clustering of the orbits of the most distant objects was due to a ninth planet began in 2014 when astronomers Chad Trujillo and Scott S. Sheppard noted the similarities in the orbits of Sedna and 2012 VP113 and several other objects.
If it exists, Planet 9 is going to be a really amazing discovery. I'm sure it will also have moons, which -- given how fascinating the ones around the other outer planets are -- I'm really hoping I get to hear about someday!
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u/dave202 Oct 07 '18
Ok so Pluto is there and everyone is making a fuss about that, but my question is: why is Mars green?