UIColorExtension.swift from https://github.com/yeahdongcn/UIColor-Hex-Swift, licensed under the MIT
license.

All planetary images are in the public domain. Image credits:
Mercury: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington
Venus: NASA/JPL
Earth: NASA/JPL
Mars: NASA, ESA, the Hubble Heritage Team (STScI/AURA), J. Bell (ASU), and M. Wolff (Space Science Institute)
Jupiter: NASA, ESA, and A. Simon (Goddard Space Flight Center)"
Saturn: NASA
Uranus: NASA/JPL-Caltech
Neptune: NASA
Pluto (it's still a planet to me!): NASA/JHUAPL/SwRI
Night Sky Background: NASA/ESA

Planetary fun facts are completely made up. :]

