[A-wal (OP)]

This question is related to the last one but is an entirely different question so I hope it's okay for them to have separate threads.


If two observers are falling towards a black hole, one behind the other then can the closer object reach and cross the event horizon from the perspective of the more distant observer before they themselves reach the horizon?

If the answer is yes then how does the closer object after crossing the horizon from the more distant observer's perspective then reemerge from inside the horizon if the more distant observer accelerates away before reaching the horizon themselves?

If the answer is no then all falling objects must reach the event horizon simultaneously so how could any object ever reach an event horizon if they can't reach it from the perspective of an observer falling in behind them?

[chris]

Why are the titles the same? Can you edit the title to make them easier to tell apart please?

[A-wal (OP)]

They're not the same. They're similar because they describe a similar but distinctly different situation.

[Bill S]

https://www.thenakedscientists.com/forum/index.php?topic=52973.msg444716#msg444716

This might be worth a look.  If I remember rightly, there were some interesting responses, including a detailed one by Pete.

[Halc]

If two observers are falling towards a black hole, one behind the other then can the closer object reach and cross the event horizon from the perspective of the more distant observer before they themselves reach the horizon?

Well, both our opinions seem to be that you can't cross the horizon, so one event does not happen before the other if neither event ever happens.

If the answer is no then all falling objects must reach the event horizon simultainiously so at what point if the life span of the black hole do all the falling objects reach the event horizon?

If the answer is yes then how does the closer object after crossing the horizon from the more distant observers perspective then reemerge from inside the horizon if the more distant observer accelerates away before they themselves reach the horizon?

Neither yes nor no since both assume event horizon is crossed.

Once again, I await the POV of somebody who argues for it being reached/crossed.

[Halc]

https://www.thenakedscientists.com/forum/index.php?topic=52973.msg444716#msg444716

This might be worth a look.  If I remember rightly, there were some interesting responses, including a detailed one by Pete.

Thanks Bill.  The topic has been covered before.  Haven't gone through it yet.