Step 1 : Before being able to fit the solar system in a 1 12 square mile , we need to find out how big the solar system is . We can do this , assuming that I he orbit of the farthest planet from the sun represents the dimension of the solar system Which planet is the farthest from the sun ? Once you have identified the planet , you need to scale the diameter of its orbit down to 1 /2 a mile , so it will fit into a 1/2 square mile