Time Machine
(JKB)
First of all, it might be
that you can build a time machine to go into the future, but not into the past,
and we don''t know about it because we haven''t yet invented that time machine.
Secondly, it might be that time travel into the past is possible, but they
haven''t gotten to our time yet, they''re very far in the future and the further
back in time you go, the more expensive it is. Thirdly, maybe backward time
travel is possible, but only up to the moment that time travel is invented. We
haven''t invented it yet, so they can''t come to us. They can come to as far back
as whatever it would be, say A.D. 2300, but not further back in time.
Then there''s the possibility that they''re here alright, but we don''t see them.
They have perfect invisibility cloaks or something. If they have such highly
developed technology, then why not? Then there''s the possibility that they''re
here and we do see them, but we call them something else?UFOs or ghosts or
hobgoblins or fairies or something like that. Finally, there''s the possibility
that time travel is perfectly possible, but it requires a great advance in our
technology, and human civilization will destroy itself before time travelers
invent it.
I''m sure there are other possibilities as well, but if you just think of that range
of possibilities, I don''t think the fact that we''re not obviously being visited
by time travelers shows that time travel is impossible.
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