Physics question

Hey, if you want a really mind-blowing physics question....

How does anything actually fall into a black hole?

Once you get to the event horizon, time dilation tends to infinity!

So you would never actually get there?:p
 
Orionaut said:
Hey, if you want a really mind-blowing physics question....

How does anything actually fall into a black hole?

Once you get to the event horizon, time dilation tends to infinity!

So you would never actually get there?:p
Click to expand...


No, the apparant slowing down of the object approaching the black hole only applies to what a distant observer sees. The object continues to accelerate until tidal forces destroy it, then the individual atoms are drawn through the event horizon. It just doesn't look like that from a distance.
 
Meridian said:
No, the apparant slowing down of the object approaching the black hole only applies to what a distant observer sees. The object continues to accelerate until tidal forces destroy it, then the individual atoms are drawn through the event horizon. It just doesn't look like that from a distance.
Click to expand...

But the object falling into the Black hole would also experience time dilation, For it, it would take forever to get past the EH.

How does this work?
 
Orionaut said:
Hey, if you want a really mind-blowing physics question....

How does anything actually fall into a black hole?

Once you get to the event horizon, time dilation tends to infinity!

So you would never actually get there?:p
Click to expand...

Sorry, but only real, PROVEN, applied Physics questions on this thread.

Black Holes indeed, pffft, might as well discuss unicorns and the big sky fairy.
 
Orionaut said:
But the object falling into the Black hole would also experience time dilation, For it, it would take forever to get past the EH.

How does this work?
Click to expand...

Its because the black hole basically bends your personal time/displacement field.

So if you imagine where you are right now is a line defined by time, and where you could be is defined by a "cone" made up of everywhere you could go in the universe, the edges of the cone is limited by the speed of light, ie it stops you going somewhere quicker than is allowed by staying under the speed of light.

Now as you approach a black hole your time curve starts to bend, because of the massive gravitational pull the closer you get the faster you'd have to go to get out. This keeps happening as you get closer until you reach the "event horizon" which is the point at which your entire future can only be going into the black hole. There's no escape as you'd need to break the speed of light to get out. To an external observer you freeze in time- they can't see what happens next because even light cant escape.

However, for you time is still passing normally, and the black hole is getting closer and closer until the mavity differential rips you apart (assuming you've even survived this far which needless to say is unlikely)

Or at least that's as good a ripoff of brian cox's dr who christmas lecture you'll get from me at this time of night.
 
I rekon if you were drawn into a black hole, things would happen fairly quickly, and exponentially so until you reached the singularity (centre). For those observing you from a safe distance however, things would probably look a bit different. As you're drawn closer, as though being swept downstream towards a waterfall, because the gravitational force of a black hole is immense it would begin to affect photons (light itself) by initially slowing any moving away from the sigularity down, and eventually pulling them all in (i.e. letting no light "out"). For anyone "looking in" it would look like your "descent" slowed to a standstill before you suppenly vanished completely. Meanwhile, you'd be spaghettified. Which is nice. :)
 
Orionaut said:
But the object falling into the Black hole would also experience time dilation, For it, it would take forever to get past the EH.

How does this work?
Click to expand...


Time dilation is only experienced by a distant observer: for the object either a) moving at relativistic speeds, or b) experiencing huge gravitational forces, time appears to pass normally. You would accelerate into the hole and be destroyed. It just doesn't look like that to a distant observer, as the time around the black hole is warped by the mavity. But only with respect to distant observers.
 
itchy said:
When it comes to black holes its spaghettification that will do you in fast. :p

https://en.wikipedia.org/wiki/Spaghettification
Click to expand...

It depends on the mass of the hole, larger mass = you'd survive reaching the event horizon

The sad thing is we'll never know what is inside a black hole because no data would ever be able to be transmitted out from one (unless we develop a FTL version of comms), so the only way to satisfy individual curiosity would be to take a one way trip to experience it first hand
 
mavity 'moves' at the speed of light which is sometimes described as as the speed of causality because it currently appears to be the fastest speed and which information can be transferred.
 
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