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SPLAT! Forming Craters and Predicting Their Size For grades 3 thru 7 Category: Space and Astronomy Hypothesis: The size of a crater formed by an object's impact will be greater when the object is bigger and faster. The size of the crater will be predictable after enough data is collected. Primary Materials Used: Plaster of Paris, Cake Pans, Ladders, Clamps, Kite String, Triple Beam Balance, Wood, Tape Measure Click Here for more details about the "SPLAT! Forming Craters and Predicting Their Size" science fair project.