Scratch is a visual programming platform with drag-and-drop code blocks to create coding projects. Here is a blog to help you build a solar system project.
Classroom Projects With Scratch - Instructables
Challenge No.3 Build your own solar system
Outer Space & Galaxy Themed Activity Ideas - S&S Blog
Scratch Blog - Adventures in Scratch by Andrew Murphy
Solar Sytem Project for Kids using Scratch
Educator Guide: Explore Mars With Scratch
Oil Pastels, Black paint (mix with dishsoap for easier clean up), Toothpicks
Solar System Mobile Craft for Kids Using Pony Beads
Scratch Code Club Australia