Question

What if two super massive black hole collide ?

(I don't need copied answers)
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Answer 1

Answer:

When two supermassive black holes collide during a merger of galaxies, we expect them to release gravitational waves – fluctuations in the fabric of spacetime. ... We have never observed merging supermassive black holes – we do not yet have the facilities for such observations.

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Answer 2

$\large\bold\red{Answered By Ayush8378 }$

When two black holes spiral around each other and ultimately collide, they send out gravitational waves - ripples in space and time that can be detected with extremely sensitive instruments on Earth...

If confirmed, it would be the first known light flare from a pair of colliding black holes...