A time travelling message.

bogwalrus

Lets say that someone from the future was able to send a message to our time. As sceptics we would read the message and disgard it is a hoax or just deem it as practicaly implausible from our current knowledge.

Lets say this message was sent to us from two weeks ahead to tell us not to turn on the lhc as it was going to cause a black hole to suck us all in.

So when this black hole forms, time/light will slow down as it gradually gets sucked passed the event horizon and time dialation effects will be intensified.

In case anyone has guessed (which you have probably not) the above is leading to a question:)

If someone in the future is near a blackhole like the one that will happen in the lhc (:P)
Will there be a point where our present will be able to see there present as in "us" being able to see "their" future state.

I ask this cause does the observer who looks at a person near a black hole just see stillness and a still image of their present while in fact that person near the black hole does not notice anything.

If that person who is near the black hole does not notice the time slowing down then they could possibly have time to send us a text message or post on this forum telling us NOT TO PRESS THAT GOD DAMN BUTTON!

I suppose penultimately the reason i ask this is because if the LHC was to create a black hole i would like to see it well in advance so as to enjoy the spectacle. But if there is a possibility of a message being sent to us before the big red button gets pressed that would be great too.:D

token56

First of all if the LHC causes a black hole big enough to kill us (which it won't), no one will be sending any messages to the past or looking at into the black hole as we would all be dead before we realised what had happened.

Now as for what happens at the event horizon of a black hole, no one can say for certain and any theories as to what happens to time, light etc are at best that, a theory. I do not believe at this moment in time anyone can predict what will happen with any great accuracy, although after some of the experiments in the LHC we might get a better understanding.

bogwalrus

well what if a black hole is created the size of a football and stays that size?? Or is that possible? From a distance all that is around it will look frozen to an observer no? I watched a cool stargate episode last night thats what got me started on this line of thinking. Had'nt seen the show in years.

So if time slows down for the peeps near the black hole but our time stays the same would we not catch up with their time as in the future??

I think i have something fundamentally flawed in my thinking

PurpleFistMixer

I'm not too well up on my blackholes (or special relativity for that matter), but I do believe any that might be created will evaporate, so you couldn't get a constant football-sized blackhole.

Surely though, if someone in the future happened to get frozen in time, they wouldn't move backwards to our time, they would simply be viewable in their present state by people "later on"... god this is some dodgy physics I'm spewing... What I'm sort of trying to get at is that at most time could stop, but not move backwards. I think.

(And if we were to "catch up", it would be a case of we wouldn't see any message until we caught up to the point at which the message was sent... at which point it'd be too late. Those evil scientists would have killed us all with their death rays.)

Delphi91

bogwalrus wrote: »

..If someone in the future is near a blackhole like the one that will happen in the lhc (:P)...

We're DOOOOMMMMMEEEEEEDDDDDD, I tell ya