Sagan covers so much ground in this episode ... which is what he does in all the other episodes as well! Sagan explains relativity to the general audience — I would never have thought that possible. Perhaps, an audience that is not trained in science would not be able to make much of this really. The spectacular ideas originating with Albert Einstein that the speed of light is the ultimate speed in the universe, that the speed of light stays constant in all frames of reference, that there are no privileged frames of reference, that time slows down as you travel close to the speed of light, all these concepts are such basic concepts of modern physics and yet very little known to the general public. Sagan talks about the original thinker that Leonardo da Vinci was and how Einstein's special relativity opens the door to the possibility of long distance space and time travel. Sagan shows sketches of spaceships of the future that utilize nuclear fusion as their power source — surely som...
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