... are two puzzling questions that astronomers are trying to answer. The black hole is fueled by the galaxy and its 800 light-year-wide spiral disk of dust. Before the discovery of this black hole, astronomers did not think that there was any dust in elliptical galaxies like NGC 4261. Currently they believe that the disk of dust is the remnant ... with a gravitational pull so large and escape velocity so high that even visible light could not escape it. This is a black hole. How are black holes formed? To our best knowledge, black holes are created at the end of a very large star's life cy...

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• Grade Level: High School