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This is an activity about the the functioning of the Interstellar Boundary Explorer, or IBEX, spacecraft. Learners will participate in an interactive demonstration to illustrate how the IBEX spacecraft uses its particle detectors to collect and sort particles that come from the boundary of the Solar System. This activity complements other IBEX informal education materials. An instructional video explaining how to facilitate this activity is available: http://bit.ly/YqwWCd.