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The era of gravitational wave astronomy has arrived. We can now not just
observe the universe, but listen to it with Gravitational Waves.  When a
compact object ventures too close a supermassive black hole, it is captured
because of the emission of gravitational waves, to be eventually swallowed
whole when it crosses the event horizon. When doing so, it radiates energy
which can be thought of as a snapshot containing detailed information about
spacetime and all the physical parameters of the system with ridiculous errors.
The process represents a mapping of warped spacetime, a unique probe of gravity
in the strong regime. Thanks to these captures, we are able to address
fundamental questions: Do black holes exist, how do they win their colossal
mass through their cosmic history, and what is the nature of their event
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