Post in forum #221228 - What makes you sad?

Sorrowless said:
The northern lights are green and purple and is also a result of the sun.

Another idea just came to mind. If you had a moon with a green or purple atmosphere, you'd be looking at green or purple sunlight, because moonlight IS sunlight.

Now that I think about it, that means anyone looking at mars with the naked eye is looking at red light from Sol.