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This interactive, online module provides students the opportunity to explore actual Hubble images and the tools used to hunt for black holes. By completing this activity, students learn about the technology required to confirm the existence of black holes. Students may complete this activity independently or in small groups. Detailed teacher pages, identified as Teaching Tips on the title page, provide science background information, lesson plan ideas, related resources, and alignment with national education standards. This activity is a subsection of "Is a Black Hole Really A Hole?" It is within the online exploration No Escape: The Truth about Black Holes, available on the Amazing Space website.