How to make a model of our solar systems !

As a kid, you are a fan of the solar system. You know quite a number of facts about each planet. You even know the number of moons that surround each planet. As the science fair approaches, you are happy to take the solar system replica as your science project. You struggle initially since you do not know how to implement your own project. Fortunately, you actually have a way to create your own solar system. You just have to find the right materials to create an exceptional replica of the sun and the nine planets.
At first, the project might baffle you, but when you discover how a ball of Styrofoam or polystyrene can substitute for the sun or any of the nine planets, you will feel that you are doing an art project. You will need a pile of art materials to create honest replicas of each component of the solar system. You will also need metal wires to connect your solar system components.
When you make your solar system replica, you should be aware of the proportional difference in size of each component. Good reference materials are the encyclopedia, the internet and your high school science books. Take note of all the details shown in the pictures and make sure that you follow them religiously when you create your solar system replica. Create a few plans, color several balls, connect each ball together and before you know it, you already have a science project.
Materials Used:

• 10 polystyrene balls of various sizes
• 20 barbecue sticks
• metal wire – 2 meters
• wooden frame (1.5 x 1.5 ft)
• varnish
• paintbrush
• paint (various colors)
• polystyrene sheets
• wood glue
• pliers
• pen
• paper
• masking tape

You first step is to create the plan of your solar system replica. Sketch the solar system on a piece of paper and take note of the sizes of each planet. Once done, finalize the dimensions of each solar system component and write them down on the same sheet of paper. You can write down the list of requirements on the other side of the paper for easy reference.
When you have completed the plan, your next step is to gather all the materials and tools for this do-it-yourself project. Go to a handicraft store and order ten polystyrene balls of various sizes. Show the sales person the plan for your solar system replica to make things easier. Once you have made the transaction, go to a hardware store and pick-up the wooden frame, the polystyrene sheets, wood glue, varnish and the metal wire. Most of these items are abundant in most hardware centers; you would not really have any problems finding any of them. Once done, go to an art store and pick up a painting kit.
When you have secured all the materials, get your painting materials and paint each polystyrene ball. Have an actual picture of the solar system when you paint each ball so that you will not have a tough time. Remember to copy the picture down to the last detail to maximize the realism of your solar system and impress your science teacher.
When you have painted your makeshift sun and planets, get ten barbecue sticks from your cupboard and stick one beneath each ball. Get the wooden frame and apply wood glue on its inner surface. Get the polystyrene sheets and fit them inside the wooden frame. Continue to stack and glue polystyrene sheets until you create a three-inch high polystyrene block. Once done, affix all of the balls on the block in accordance to the positions of the sun and the nine planets.
Your next step is to recreate the orbits that each planet travels. Refer to your plan to determine the length of every orbit then get the metal wire and pliers. Now, cut nine strips out of your supply of metal wire, in accordance to the stated dimensions in your plan. Bend each metal wire to create large ovals. When you are done, stick one end of each metal wire to its corresponding planet then tie both ends of each metal wire together.
To make each orbit stay upright, you can affix barbecue sticks in strategic locations on the polystyrene base then tape the sticks to the respective orbits. You can move your solar system replica from one location to another just to check if all the components will hold up. If a few planets fall, you can add more barbecue sticks to further reinforce the orbits.
At this point, your solar system replica is almost finished. Get your can of varnish and a clean paintbrush then varnish the wooden frame and polystyrene base. Eventually, the varnish will harden and reinforce the sturdiness of the polystyrene base. It will also make your solar system replica look more elegant. When the varnish dries, your solar system is ready for display.
Your newly-made solar system replica will probably garner “oohs” and “ahs” in the upcoming science fair. Whether you win the “Best Project” award or not, you will surely love the idea that you played God at least once in your life.
and it was a copy paste from that site .