A short educational film by ILM's Tom Smith. What I find really fascinating is that it was done entirely with analog SFX.
"Nearly all of the shots involved a moving camera. It was like animation with three dimensional model planets instead of cell images. We found the best material for the planets was hard wood. So we hired a Hollywood cabinet shop to make nine spheres for us, about 18 inches in diameter. These were sanded and painted to match images in astronomy books and observatory photos."
It's narrated by the apple of Gypsy's eye, Richard "Admiral Nelson" Basehart. And since it was made long before the discovery of the Kuiper belt it still counts the KBO Pluto as a planet.