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For my lunar space robot, took a block of Styrofoam, and wrapped it with aluminum foil. Next, with the help of my parents, I made wheels from 2 nails, and 4 toy wheels. After that, I took a toy (see picture), and attached a "vacuum" with a pipe cleaner and a ping-pong ball. Finally with another 2 pipe cleaners, more aluminum foil, one more nail, and stickers, I made a satellite and a camera. This was my process, but the way it would have worked is that the vacuum would have picked up the soil, and dropped it in the bucket to transport.