The closest black hole is about 1600 light years away (i.e. it takes 1600 years for light to travel that distance) but we’re not really sure if that’s the closest one.
But it means that we would’ve had to have sent a probe that travelled from the Earth at the speed of light (which we can’t do) 1600 years ago (which we couldn’t do then) and it would only just have reached that black hole.
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