What happens when black holes collide? | EXPERT ANSWERS PHYSICS GIRL QUESTIONS

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What happens when black holes collide? What is the speed of gravity? There are so many weird questions related to gravitational waves.
Why are there giant concrete tunnels in the desert? - https://www.youtube.com/watch?v=DjcS1kRkc6M

If you liked this video check out these:
What is a Black Hole? - Stephen Hawking's final theory
https://youtu.be/SdySHadrYAA
The Most MYSTERIOUS Object in the Universe
https://youtu.be/GHsQl-k3syg

Thanks to Amber Strunk, Michael Landry and LIGO Hanford Observatory!

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Here's the 'capstone' paper Michael and I talked about https://iopscience.iop.org/article/10.3847/2041-8213/aa91c9
https://rumblevideoarchive.wordpress.com/