On a stormy day, the surface of Norus appears a bluish gray with dark, overcast skies. On a sunny day, the sky appears light yellow.
In 2265, while investigating an empty Eldorian spy ship, James T. Kirk and Spock were abducted by a long distance transporter and imprisoned on Norus as enemy spies. They were forced into a trial by combat against a giant robot moloth, then sentenced to execution by the planet's ruling council. Montgomery Scott and a rescue party joined the crew of the Eldorian warship Lebron to recover the two officers. (TOS comic: "Menace of the Moloth")