Notices
Results 1 to 8 of 8

Thread: Orbiting a Black Hole

  1. #1 Orbiting a Black Hole 
    Forum Freshman
    Join Date
    Jul 2012
    Posts
    36
    Hey! Could a spaceship [assume its a futuristic one with more advanced technology, etc.] orbit a black hole in order to allow time in the universe to pass quicker than for time in the spaceship? How much faster would time be 'outside' than near the black hole-- and how close would you have to be? Could you tread the event horizon, or would significant time dilation only occur inside the black hole itself- rendering the whole question useless? I'm writing a book and need a method of allowing thousands, tens of thousands of years, etc. to pass quickly for only a few generations of humans. Thanks!


    Reply With Quote  
     

  2.  
     

  3. #2  
    Anti-Crank AlexG's Avatar
    Join Date
    Mar 2012
    Posts
    2,809
    See the book Tau Zero by Poul Anderson.


    Its the way nature is!
    If you dont like it, go somewhere else....
    To another universe, where the rules are simpler
    Philosophically more pleasing, more psychologically easy
    Prof Richard Feynman (1979) .....

    Das ist nicht nur nicht richtig, es ist nicht einmal falsch!"
    Reply With Quote  
     

  4. #3  
    Moderator Moderator Janus's Avatar
    Join Date
    Jun 2007
    Posts
    2,205
    You can orbit a black hole as long as the radius of your orbit is greater than 3/2 the radius of the event horizon.

    The time dilation can be found by



    This includes both the time dilation due to gravitational potential and that due to orbital speed.
    "Men are apt to mistake the strength of their feelings for the strength of their argument.
    The heated mind resents the chill touch & relentless scrutiny of logic"-W.E. Gladstone


    Edit/Delete Message
    Reply With Quote  
     

  5. #4  
    AI's Have More Fun Bad Robot's Avatar
    Join Date
    Apr 2013
    Location
    Washington state
    Posts
    6,114
    Quote Originally Posted by MrPiano View Post
    Hey! Could a spaceship [assume its a futuristic one with more advanced technology, etc.] orbit a black hole in order to allow time in the universe to pass quicker than for time in the spaceship? How much faster would time be 'outside' than near the black hole-- and how close would you have to be? Could you tread the event horizon, or would significant time dilation only occur inside the black hole itself- rendering the whole question useless? I'm writing a book and need a method of allowing thousands, tens of thousands of years, etc. to pass quickly for only a few generations of humans. Thanks!
    Suppose we assume you can do it. Why would you want to do it? It looks like it would be a one way trip into some unknown future. You wouldn't be able to go back in time, so you would be stuck in whatever future you found. What would you do if you found humans went extinct and you and your companions were now the only humans left alive in the galaxy?
    Reply With Quote  
     

  6. #5  
    Forum Professor astromark's Avatar
    Join Date
    May 2013
    Location
    New Zealand
    Posts
    1,015
    ~ The concept exists.. and has some 'Issues' Not only would you need to have some special advanced ship

    you would need to get there. and knowing the human lifespan and the distances.. 'NO'.

    Good science fiction needs to be within probability but that's only 'My' view. Interesting as it is...
    Reply With Quote  
     

  7. #6  
    Forum Freshman
    Join Date
    Jul 2012
    Posts
    36
    Quote Originally Posted by Bad Robot View Post
    Quote Originally Posted by MrPiano View Post
    Hey! Could a spaceship [assume its a futuristic one with more advanced technology, etc.] orbit a black hole in order to allow time in the universe to pass quicker than for time in the spaceship? How much faster would time be 'outside' than near the black hole-- and how close would you have to be? Could you tread the event horizon, or would significant time dilation only occur inside the black hole itself- rendering the whole question useless? I'm writing a book and need a method of allowing thousands, tens of thousands of years, etc. to pass quickly for only a few generations of humans. Thanks!
    Suppose we assume you can do it. Why would you want to do it? It looks like it would be a one way trip into some unknown future. You wouldn't be able to go back in time, so you would be stuck in whatever future you found. What would you do if you found humans went extinct and you and your companions were now the only humans left alive in the galaxy?
    That's kind of the point, I'm writing a fiction novel and need a forward time travel mechanism for the plot. thanks for all the help!
    Reply With Quote  
     

  8. #7  
    Suspended
    Join Date
    Nov 2012
    Location
    Apocalyptic Paradise
    Posts
    6,613
    Quote Originally Posted by MrPiano View Post
    That's kind of the point, I'm writing a fiction novel and need a forward time travel mechanism for the plot. thanks for all the help!
    Have them move at near "c" and then return to Earth.
    Reply With Quote  
     

  9. #8  
    Anti-Crank AlexG's Avatar
    Join Date
    Mar 2012
    Posts
    2,809
    Quote Originally Posted by Neverfly View Post
    Quote Originally Posted by MrPiano View Post
    That's kind of the point, I'm writing a fiction novel and need a forward time travel mechanism for the plot. thanks for all the help!
    Have them move at near "c" and then return to Earth.
    Joe Haldeman's Forever War has a relativistic shuttle, that just goes out and back at relativistic speeds.
    Its the way nature is!
    If you dont like it, go somewhere else....
    To another universe, where the rules are simpler
    Philosophically more pleasing, more psychologically easy
    Prof Richard Feynman (1979) .....

    Das ist nicht nur nicht richtig, es ist nicht einmal falsch!"
    Reply With Quote  
     

Similar Threads

  1. What if a black hole passes near another black hole?
    By kojax in forum Astronomy & Cosmology
    Replies: 5
    Last Post: July 25th, 2013, 06:07 PM
  2. black hole and white hole
    By mmmyyydas in forum Pseudoscience
    Replies: 4
    Last Post: March 25th, 2011, 02:06 AM
  3. WHAT DOES A BLACK HOLE WITH A WHITE HOLE=?
    By ADAMA in forum Physics
    Replies: 4
    Last Post: April 20th, 2009, 11:42 PM
  4. GR and Black hole
    By basim in forum Astronomy & Cosmology
    Replies: 3
    Last Post: September 19th, 2007, 11:42 PM
  5. Gaping hole could be a black hole scar?
    By MatTron in forum Astronomy & Cosmology
    Replies: 3
    Last Post: September 2nd, 2007, 08:29 AM
Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •