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system, year Prior Knowledge Questions (Do these BEFORE using the Gizmo.) 1 . Name all the planets you can think of Earth , mar, platesatun, mercury 2. What object is at the center of the solar system? the san and a s-tour 3. What force keeps the planets from flying out of the solar system? ther san's , gravity ly Gizmo Warm-up On the Solar System Gizmo, check that the ORBIT tab is selected. At first you can only see the four inner planets. The distances of the planets to the Sun are to scale, but sizes are not. 1. Move the cursor over each planet to learn its name. What are the four inner planets? Mercy, venasy Barth, marsh These planets are called rocky planets because their surfaces are rocky. 2. Click the "-" button (upper right) three times to zoom out. What are the names of the four outer planets? These planets are called gas giants because they are essentially huge balls of gas. 3. Before 2006, while Pluto was still considered a planet, people used this saying to remember the names: "My very excellent mother just sent us nine pizzas." Come up with a new sentence to help remember the eight planet names, in order