what happens to somthing after it is sucked into a black hole?

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The process that an object undergoes when it passes the event horizon (the point of no return) of a black hole is called spaghettification.  The object is stretched indefinitely by extreme tidal forces until the bonds between atoms in molecules are no longer able to oppose these forces causing them to break apart into their constituent atoms.  Once these atoms reach the singularity at the center of the black hole they are crushed together by extreme gravitational forces into an infinite density, the mass of which is added to the total mass of the black hole.  This in effect increases the gravitational pull of the black hole even more.

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