Can outside matter decrease the event horizon size of a black hole?
Answers
Yes, the event horizon is due to the total gravitational field, not just the stuff inside the black hole. So putting enough mass close to it makes it expand
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Explanation:
If its mass collapses into an infinitely small point, a black hole is born. Packing all of that bulk—many times the mass of our own sun—into such a tiny point gives black holes their powerful gravitational pull. Thousands of these stellar-mass black holes may lurk within our own Milky Way galaxy.
A black hole's gravity is so powerful that it will be able to pull in ... will be pulled into the black hole before it is destroyed.
The event horizon is where the escape speed exceeds the speed of light: you'd have to be going faster than light (which is impossible for any bit of matter) to escape the black hole's gravity. Inside the event horizon is where physics goes crazy. ... A singularity is what all the matter in a black hole gets crushed into.