ELI5 | What is the ‘event horizon’ as described by Stephen Hawking and what does it mean for time, space and light?

But in reality they have fallen in, so if someone new comes to observe, would they also see the frozen person on the edge?

They would see the person at the edge, because the person would actually be at the edge. And from the person at the edges perspective, everything outside their frame of time would appear to be moving a zillion miles an hour. Which doesn't entirely make sense since the speed of light is constant and light would have to have time to get from things to the person at the edge and things would be moving so fast relative to the person "frozen" at the edge, everything would just look like some kind of blur I suppose. But its a way of looking at it, this is how space and time work as far as we know. Strange things happen at these kinds of extremes where the relationship between mass/velocity, space/time, and the constant speed of light merge.

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