Basically, Newton wanted there to be 7 colors because 7 is such an awesomely cool number. Mainly, there were 7 objects you could see in the sky. Ask your students if they can name these 7 objects, its fun.
My students were also surprised to see the connection between the days of the week and the seven planets. It is easier to see this connection in a language other than English. First, the objects. In Spanish, they are (here are the planets in tons of languages):
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