Could we ever actually throw stuff into a black holes?

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Could we shoot a voyager type of spacecraft into a black holes and see what happens?

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Practically, no, because it already takes light about 1500 years to reach the closest BH.

Theoretically, no, because anything that passes the event horizon will disintegrate. The definition of that singularity is that every particle, including the photons particles use to interact, that passes the threshold will have the same future, bar none. Your probe will cease to be and every bit of it will end up in the same place and time as every other bit in there.

Theoretically, and as has been demonstrated, the gravitational field of the black hole causes time dilation to the point where the probe will happily travel towards the event horizon as it had been doing from the start, but every inch closer it gets, the longer it takes _for us_ to see any light come back from it. Even if the probe didn’t pass the horizon, but simply slung around the BH and came back, depending on the distance to the horizon, it could well be that it would take that probe an hour to do so, while we’d be waiting for decades.

So in every sense, no, we couldn’t.

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