Just for fun
Just for fun, as long as I was teaching ray tracing to my class, I created a cool ray traced animated planet.
I did it in such a way that you can see and edit the shader code right next to the animated planet itself. By changing different things in the code, you can explore the effect of changing one thing or another in the shader code on the appearance of the simulated planet.
You can try it out for yourself by CLICKING HERE.