PHY 171A Lab 4 Worlds of Wonder Purpose To use a simulation to study the orbital mechanics of a simplified solar system Apparatus Computer, PhET simulation: \"My Solar System" (available at http:llphet.colorado.edu) Introduction Lab activities involving stars and planets are difficult to conduct inside a classroom or laboratory. Since we cannot create stars and planets to experiment with in the classroom, we will use a computer simulation that uses the laws of gravity to show the behavior of large objects at great distances from one another. Procedure SETUP Step 1: Start the computer and let it complete its start-up process. Step 2: Open the PhET simulation, \"My Solar System," available at httpzlfphetcolorado.edufenfsimulationlmysolar-system. Step 3: When the simulation opens, the screen should resemble the figure below. Figure 1- My Solar System