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Interstellar Travel Answer to failing Earth?

January 24, 2015
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Interesting article below.  The only thing it doesn’t account for is that scientific discoveries occur exponentially and build on each other.  What looks difficult or impossible now might be easy in 20 or 30 years because of some breakthrough that affects many things.  The invention of the computer would be one example of a breakthrough.

 

http://io9.com/after-earth-falls-will-interstellar-space-travel-be-ou-1681374745

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