Question: If 2 black holes get near each other, can they then gravitationally pull matter out of the other black hole & back into “normal” space?
The short answer is no.
A black hole (in the traditional sense) is defined as an object that has collapsed so that its radius is equal to, or less than, the Schwarzschild of the object.
What does this mean?
Every object has a Schwarzschild radius; this is the point at which an object’s mass is so compressed that the gravitational influence overpowers the other forces of nature and it collapses to a singularity.
Of course, not every object is massive enough to collapse to its Schwarzschild radius. The Earth’s Schwarzschild radius, for example, is about the diameter of a small marble. If you were to apply enough energy to the Earth and compress its mass to that size, it would collapse to form a black hole. The same is true for humans, except I’d need to compress you to a point some 10-million times smaller than a marble in order to turn you into a black hole.
So, what is special about the Schwarzschild radius? This is the point at which the escape velocity for the object is equal to the speed of light. Obviously, since you can’t travel ,or faster than, the speed of light you can’t get out of a black hole neither can another black hole pull you out.
It’s important to realize that, outside of the Schwarzschild radius (also known as the event horizon), spacetime is normal. You can interact with a black hole in the same ways you interact with any other object of mass.
Image credit: NASA/CXC/A.Hobart
Article: From Quarks to Quasars
NGC 602: Taken Under the “Wing” of the Small Magellanic Cloud
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God of War Fan Art by thekidKaos on deviantart
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Queensland Solar Eclipse
Composite of images taken with a William Optics Zenithstar II (545mm, f6.4) and Canon 5D MarkII camera (ISO100), with exposures from 1/90th sec to 2 seconds long. For the outer parts, I have also used some images captured with a Pentax 300mm f4 ED IF lens (1/4 and 1sec at ISO100) and another Canon 5D MarkII. Those two imaging trains were tracking on my trusty old Vixen GP-DX mount. — Phil Hart