Substance that made up it's surface
To hide from predator planets.
Yes. Planets and moons come in all sizes and colors.
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nitrogen oxide
It depends on the particular planet.
maybe because GOD made it.
Pluto has the main colors of brown, blue, and some yellow. All these colors are mixed in various parts of the planets.
They all are different colors
It changes by the storms and wind in the planets atmosphere
by how far they are from the sun or their condition in space
We do not know. Although we have detected planets in other solar systems, we do not know what colors they are.
well basically the planets is made from harder materials like rock, rather than gases.