How close can you get to a black hole?

Streams of gas fall to their dooms, plunging into black holes, locked away from the universe forever. In their final moments, these gassy shreds send out one last flare of light, some of the brightest emissions in the universe. 

These death dives are too far away to be seen directly, but astronomers have devised a new technique for detecting their panicked cries for help. They’re using the method to test our knowledge of gravity in the most extreme environments in the universe.

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