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This activity is one of several in which students are required to access and analyze actual data from NASA missions, including video "interviews" with real NASA scientists, to solve a mystery. In this mystery, students are challenged to determine if a signal from space has a natural origin, or if it actually is a message from aliens. Alien Bandstand can be used as a supplemental learning tool to reinforce the scientific method, and as an example of how scientists analyze data in real-world situations. It is one of several activities within "Space Mysteries," a series of inquiry-driven, interactive Web explorations. Each Mystery in "Space Mysteries" is designed to teach at least one physical science concept (e.g. interactions of energy and matter, structures and properties of matter, energy, motion, or forces), and is accompanied by materials to be used by classroom teachers.