The 4M Hybrid Solar-Powered Solar System (00-03416) is a build-it-yourself planetarium in which the planets orbit the Sun. Students assemble the frames, spindle and arms, gearbox, motor and solar panel, then place the Sun and the eight planets on the arms.
A switch selects the power source: in sunlight the solar panel drives the motor, and when there is not enough light the model runs on one AAA battery, which is not included. A small crosshead screwdriver is also needed for assembly.
The instructions explain how solar cells turn light into electricity, how gears slow the motor down, what an orrery is, and how the model differs from reality, since real planets orbit at different speeds. This makes the kit a useful link between space science and energy lessons.