This coloring page shows the planet Mercury, which is closest to the sun in our solar system. Its surface is craggy and pockmarked with craters. The atmosphere on the planet is incredibly thin, so the stars and constellations can be seen in the night sky. The planet has no moons, and its size is very small. For a nice contrast, I would suggest coloring the background of the page dark to make the craters stand out. Then, fill in the planet with a pale yellow or orange to highlight the bright surface. Swirls of purple or pinks can be used to give the coloring page a little bit of interest, while adding some glittering silver stars in the background can really make the page sparkle.