Solar System Marble Set is a beautiful do-it-yourself solar system for kids. Each of the ten included marbles represents a planet or the sun and is sized appropriately. Kids playing with this set or making it into a model will learn the order of the planets and other features represented by the marbles. This well-made set is beautiful and would make a great school or homeschool solar system project. Although the manufacturer recommends this set for ages three to fifteen, it is most appropriate for older kids in no danger of putting the marbles in their mouths, which my four year old still might. Younger children can, of course, enjoy this with supervision. I can easily picture this on the desk or dresser of a young space science fan.