What would happen if two black holes collided?

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SUMMARY

The collision of two super-massive black holes results in the conservation of surface area, with the mass-energy difference released primarily as gravitational waves. When two black holes of mass 1 and radius 1 collide, their combined area is 2, but a single black hole of mass 2 has an area of 4 due to the squared relationship between radius and area. The proportion of mass radiated as energy during this process is calculated as (1-sqrt(2)/2) = 0.293. Proximity to such a collision would pose severe risks to any nearby entities.

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  • Research gravitational wave detection techniques, such as LIGO and Virgo
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Astronomers, astrophysicists, and students interested in black hole dynamics and gravitational wave research will benefit from this discussion.

Sniperman724
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What would happen if two super-massive black holes collided with each other? I know it may be a very unlikely scenario.
I just started thinking about this for about a week and I wanted to see what anyone had to say about it.
Thanks!
 
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The surface area of the holes is conserved. When they collide the difference in mass-energy implied by that is released, mostly as gravity waves.

To see why, consider two black-holes of mass 1, radius 1 and thus area 1. Total area is 2, but a black hole of mass 2 has an area of 4, because the radius scales linearly with the mass, but the area with the square of the radius. To get an area of two the radius is sqrt(2) and the proportion of mass radiated away as energy is (1-sqrt(2)/2) = 0.293. Being nearby the collision of two super-massive black-holes would be incredibly unhealthy...
 
http://www.black-holes.org/explore2.html
 
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