How can two black holes with event horizons merge within the lifetime of the universe? Basically events are happening where events stop (to the outside observer) so does an event horizon actually exist? According to gravitational wave detectors on Earth, two black holes merged within fractions of a second.
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Here is a related question: https://physics.stackexchange.com/q/26478/ – Chiral Anomaly Nov 15 '18 at 04:23
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Possible duplicate of So Black Holes Actually Merge! In 1/5th of a Second - How? – John Rennie Nov 15 '18 at 05:18
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Also Can black holes actually merge? – John Rennie Nov 15 '18 at 05:18