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Thank you so much for this excellent write-up! And for providing interesting reading material, too.
It's amazing to me (an uneducated sub-layman) that things like dark matter and dark energy aren't well-understood, but we can nonetheless still do this kind of science and detect black holes colliding through ripples in spacetime 🤯 But then again, it's amazing to me that rivers never run out of water (joking... sort of...).
That LIGO sound clip is for sure going into the intro of a metal song.
Dark matter and dark energy are not necessarily connected to black holes. The latter are relatively well understood on their own.