[ RadSafe ] time travel

[Brennan, Mike (DOH)]

"What do we want?"

"TIME TRAVEL!"

"When do we want it?"

"THAT'S IRRELEVANT!"

-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu [mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Joseph Preisig
Sent: Wednesday, September 02, 2015 7:04 PM
To: radsafe
Subject: [ RadSafe ] time travel

Radsafe,

      Perhaps one of you younger Radsafe folks may eventually design a spaceship (powered by reactors???) which can do time travel.  You will need a spaceship if you intend to do this, because as you travel in time, the Earth, planets and stars will move around in Space.  As you move in time, the Earth will move to a new location.
Your spaceship will need guidance and navigation systems that account for planetary orbits,  movement of stars due to the big bang, and other motions.  The VLBI group at NASA Goddard Space Flight Center may have some computer programs (CALC, SOLVE) which may be helpful in designing guidance and navigation systems.
       Useful books might include Special Relativity by AP French and Gravitation by Misner, Thorn and Wheeler (general relativity).
       Funny, Hawking (on facebook the other day) asked a question which was something like --- what was God doing before the Big Bang.???  Pretty cool, huh???
Well, one big bang is not a very general model.  One could envision a series of multiple Big Bangs (in series, or some other time distribution).  This is a more general model than ONE Big Bang.
Perhaps God does roll dice.  Perhaps he/she can do anything he/she pleases....
      God snaps his fingers or whatever, and a Big Bang happens.  The stars and planets move outward from the starting point (and starting
time) of the Big Bang.  Perhaps much later on, the outward movement slows and stops and perhaps gravitational collapse starts to occur.
And maybe the process will be repeated
again.
        I leave it to Brennan, Karam, others to back project our current Big Bang to the original starting location and time???

       Joe Preisig
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