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In this interactive, online activity, students estimate the distances of objects in the Hubble Deep Field from Earth using the relationship between size, brightness, and distance. Students can complete this activity independently or in small groups. Detailed teacher pages, identified as Teaching Tips on the activity title page, provide science background information, lesson plan ideas, related resources, and alignment with national education standards. This activity is part of the online exploration "The Hubble Deep Field Academy" that is available on the Amazing Space website.