<p>The confusion about finite or infinite time dilation at the Schwarzschild radius began since Karl Schwarzschild in 1915 used a space-time coordinate system where coordinate time went to +∞ when a falling object approached the Schwarzschild radius. But <em>t</em> → +∞ for a world line that approaches the horizon is a thing different from <em>t</em> → +∞ far from the black hole. An object that is about to cross the horizon is in no position to synchronize clocks with an outside world.</p>

<p><strong>No,</strong> completely opposite situation to the OP’s expectations. If a falling observer will <em>transmit</em> a powerful beam of light out of the hole, then photons will reach increasingly far future of the exterior universe. But the future <em>seen</em> by the falling observer will be very limited; see <a href="http://jila.colorado.edu/~ajsh/insidebh/penrose_schw.html" rel="nofollow">http://jila.colorado.edu/~ajsh/insidebh/penrose_schw.html</a> for graphic depiction.</p>

CC BY-SA 3.0
2014-08-25T23:18:51.257Z
The only people who are still confused about the difference between coordinate and true singularities are at most beginning students. So it is not clear about _who s_ confusion the first sentence talkes about; working physicists can not be meant.
Dilaton
CC BY-SA 3.0
2014-08-27T07:03:10.787Z
@Dilaton: some people trying to understand black holes become confused. And not necessarily about “coordinate singularity” in Schwarzschild’s coordinates, but generally about clock synchronization with a falling object. I do not see how your comment about supposed “working physicists” is helpful.
Incnis Mrsi
CC BY-SA 3.0
2014-08-22T08:23:47.587Z
2014-08-22T08:23:47.587Z
Incnis Mrsi
<p>I know someone or something sucked into a black hole could not survive, but is the bending of light so immense that an observer falling into a black hole will be able to witness any future events in the universe? That would definitely be cool :D I have a feeling this won't work though... so could you explain in detail why? Thanks.</p>

CC BY-SA 3.0
2016-11-08T18:28:23.880Z
Hello? This question is over 3 years old. Plus, that other question is almost a year newer than this one. Check the dates next time, please.
Timtech
CC BY-SA 3.0
2016-11-08T18:41:05.790Z
Timtech, it's fine to do so if the newer question has answers (especially if they're much better answers); see [this Meta post](http://meta.stackexchange.com/q/147643/274942)
HDE 226868
CC BY-SA 3.0
2016-11-08T19:14:47.150Z
First off, these are significantly different questions. Plus, my answer (score 9) was suddenly deleted by some moderator. Is there a necro delete going on or something? Can't find enough work to do with newer questions, so you have to revisit older ones?
Timtech
CC BY-SA 3.0
2016-11-09T14:23:20.047Z
@Timtech I am not omniscient. I rely on the community's help to moderate. When the community flags a post that is in violation of the community rules (["Quote only the relevant portion" "Do not copy the complete text of external sources; instead, use their words and ideas to support your own. And always give proper credit to the author and site where you found the text, including a direct link to it."](http://astronomy.stackexchange.com/help/referencing)), it is my job to request that it be amended--and if it is not in a timely manner, to delete it.
called2voyage
CC BY-SA 3.0
2016-11-09T14:23:49.737Z
@Timtech Also, if you have been targeting downvotes, be aware that these are tracked in the system and will be dealt with.
called2voyage
<black-hole><horizon>
Will an observer falling into a black hole be able to witness any future events in the universe outside the black hole?
Timtech
# Will an observer falling into a black hole be able to witness any future events in the universe outside the black hole?

(Asked by: username_0 on 2013-09-25)

I know someone or something sucked into a black hole could not survive, but is the bending of light so immense that an observer falling into a black hole will be able to witness any future events in the universe? That would definitely be cool :D I have a feeling this won't work though... so could you explain in detail why? Thanks.

**Tags:** black-hole, horizon

> **Comments:**
> **username_0**: Hello? This question is over 3 years old. Plus, that other question is almost a year newer than this one. Check the dates next time, please.  
> **username_1**: username_0, it's fine to do so if the newer question has answers (especially if they're much better answers); see [this Meta post](http://meta.stackexchange.com/q/147643/274942)  
> **username_0**: First off, these are significantly different questions. Plus, my answer (score 9) was suddenly deleted by some moderator. Is there a necro delete going on or something? Can't find enough work to do with newer questions, so you have to revisit older ones?  
> **username_2**: @username_0 I am not omniscient. I rely on the community's help to moderate. When the community flags a post that is in violation of the community rules (["Quote only the relevant portion" "Do not copy the complete text of external sources; instead, use their words and ideas to support your own. And always give proper credit to the author and site where you found the text, including a direct link to it."](http://astronomy.stackexchange.com/help/referencing)), it is my job to request that it be amended--and if it is not in a timely manner, to delete it.  
> **username_2**: @username_0 Also, if you have been targeting downvotes, be aware that these are tracked in the system and will be dealt with.  

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## 1 answers

### Answer by username_3 on 2014-08-22. Score: 1

The confusion about finite or infinite time dilation at the Schwarzschild radius began since Karl Schwarzschild in 1915 used a space-time coordinate system where coordinate time went to +∞ when a falling object approached the Schwarzschild radius. But *t* → +∞ for a world line that approaches the horizon is a thing different from *t* → +∞ far from the black hole. An object that is about to cross the horizon is in no position to synchronize clocks with an outside world.

**No,** completely opposite situation to the OP’s expectations. If a falling observer will *transmit* a powerful beam of light out of the hole, then photons will reach increasingly far future of the exterior universe. But the future *seen* by the falling observer will be very limited; see <http://jila.colorado.edu/~ajsh/insidebh/penrose_schw.html> for graphic depiction.

> **Comments:**
> **username_4**: The only people who are still confused about the difference between coordinate and true singularities are at most beginning students. So it is not clear about _who s_ confusion the first sentence talkes about; working physicists can not be meant.  
> **username_3**: @username_4: some people trying to understand black holes become confused. And not necessarily about “coordinate singularity” in Schwarzschild’s coordinates, but generally about clock synchronization with a falling object. I do not see how your comment about supposed “working physicists” is helpful.  

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