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In this activity, learners use visible light, radios, infrared remotes, heat lamps, and black lights (ultraviolet) to identify detectors of these sources as well as materials that transmit or block the energy. This activity is available on the back of the Electromagnetic Spectrum Poster which is a collaborative product of Astrophysics missions and staff comprising the Astrophysics SEPOF. The Astrophysics SEPOF is headquartered at the Space Telescope Science Institute, operated for NASA by the Association of Universities for Research in Astronomy (AURA). Request a paper copy of the poster from SEPOF through the "contact us" page of Amazing Space - be sure to include your mailing address.