Carl Sagan, a noted author, talks about the theory of time travel. Behind all of his long statements, he is basically saying the same thing as everyone else.
Time Travel into the future is possible
The past is another story
Nature could possibly stop all paradox's from occurring
There could be alternate universes, but maybe not
Yes, all he does is sum up what we have been talking about this entire unit. And in the end, he really doesn't give his opinion on anything, saying that there is no point when we have such a lack of knowledge on the matter.
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