Wednesday, November 20, 2019

general relativity - Practical time travel: time dilation above the event horizon



Imagine there is a huge black hole with very small gravity gradient so that one doesn't get killed by spaghettification after even nearing the event horizon.


Now imagine a very curious creature wanting to know how the universe would evolve. Even though it isn't sure it will be able to return, it decided to travel just close enough to the event horizon to survive, and stay there until for as long as it can make.


For how far would the creature see the future? Is this even possible? What should one expect?




This question was inspired by Miller's planet from the movie Interstellar.





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