Creative Toy. Stylish Decor. Crank the handle. Every planet is orbitting on its own track in different speed (not the exact speed as real system). This huge orrery model is really worth your time. Just follow the manual strictly, and you will make it. Pieces: 316pcs/9 marbles Assembly Time: 7h Assembled size: 16x16x14 inch Build Your Own Solar System Handcrank to glow. ROKR Huge Orrery is a solar system-planetary orbits model. The 3D puzzle demonstrates the relative positions of planets, and simulate their orbits in space. To assemble the gear-drive machines, you need to be very concentrated and patient. You will surprise everyone withOnce completed, just crank the handle to see the sun glowing and planets orbiting around it. the grand result. Premium Gift for craft lovers or someone you love STEM concept and Engineering constrction game Stylish Decoration on desk or shelf Note: If you have replacement part need, feel free to tell us. Glowing Sun When crank the handle, not only planets orbits but also sun glows in dark. Hand Generator Orbits are driven by built-in gear trains. Glowing sun is powered by hand generator. Rotatable Gadget The sun decor will spin when you rotate the gear below. Marble Parkour Marble Night City Luminous Globe Classic Gramophone Zodiac Wall Clock Cruiser Motorcycle Add to Cart Add to Cart Add to Cart Buying Options Add to Cart Add to Cart Customer Reviews 4.5 out of 5 stars 2,999 4.2 out of 5 stars 630 4.4 out of 5 stars 1,287 — 4.6 out of 5 stars 287 4.8 out of 5 stars 217 Price $42.99$42.99 $56.99$56.99 $52.99$52.99 — no data $56.99$56.99 $46.99$46.99 Pieces 254 pcs 294 pcs 180 pcs 424 pcs 168 pcs 420 pcs Assembly Time 6h 7h 4.5h 10h 3.5h 5h Need Glue X X X X ✓ X Power Handcrank Handcrank Electricity Handcrank Battery Handcrank