Black holes are notoriously hard to detect, since they are as black as the space surrounding them. We can only pinpoint them in special circumstances, like when they pull down gas from a neighboring star or merge together, releasing a flood of gravitational waves.
There are so many black holes in the Universe that it is impossible to count them. It’s like asking how many grains of sand are on the beach. Fortunately, the Universe is enormous and none of its known black holes are close enough to pose any danger to Earth.
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