I know that it doesn't have all of the planets, but they still look 3D. This is just to prove that you can make some 3D looking objects in Scratch without having to have a ton of clones.
To make this I had to make a circle, then shade it so that it looked like a sphere, then made copies in different colors/shades. I then deleted part of the copies so that it would look like something (e.g. the landmasses on Earth).