The physics of time travel is still in its infancy ... in response to his urgings for investment in radio in the 1920's) "Professor Goddard does not know the relation between action and reaction ...
Like stretch marks left on skin that expanded too quickly or cracks embedded in freezing ice, cosmic strings are artifacts of what the universe looked like in the moments before it rapidly changed ...
The grandfather paradox is just one of the thorny logical problems that arise with the concept of time travel. But one ...
The Professor made decades of research into black holes and Einstein’s theories of relativity his basis for devising the time ...
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