Theory and observations about Future Time Travel.

The only way to discover the limits of the possible is to go beyond them into the impossible.

-- Arthur C. Clarke. "Technology and the Future". Report on Planet Three. 1972

• The Einstein Universe
  About Time, relativity and the universe.
  
  
• Spirit World
  About the possible existence of a non-physical spirit world.
  
  
• Time Travel in Spirit World
  Could there be time travel for ghosts?
  
  

• Virtual chat for spirits
  How can we visualise communication between non-physical entities?
  
  
• If it can be done it will be done...
  If time travel and sending messages to the past will be possible than the effects must be already visible.
  
  
• Galileo - Time Travel Theory and Conflict
  Theories that conflict with religion, are hard to be accepted.
  
  
• Consequences of Time Travel.
  If the technology of sending messages back to the past gets developed, there will be different opinions about the consequences and side effects.
  • The non-believers
  • The believers
  • The dubious
  
  
• The chicken and the egg.
  Time travel and the relationship between causality and chronological events (The principle of causality).
  
  
• Catching up.
  A change in the past might ripple 'back' to the time of the senders. This might lead to the 'grandfather paradox'.
  
  
• Multiverse - Worlds apart.
  Theories that talk about parallel worlds or mirrored worlds, or even parallel universes.
  
  
• Resposibility.
  Responsibility related to time travel is an issue of great importance, but might be overlooked.
  
  
• Time Travel and Blind Spots.
  The sender might know the future of the receiver. But there are blind spots of which even he can't know.
  
  
• Time Travel Paradox.
  Paradoxes and the Multiverse theory.
  
  
• Time Travel and Changing the past.
  Ideas on why anyone would consider changing history