Tyson presents the mysteries of the universe: the invisible. He goes into the implications of gravity and ultimately to the explanation of the black hole. He discusses the possibilities of Einstein's theory of relativity and the limitations presented by the consistency of the speed of light. He talks about the Big Bang and the relative positioning of all things cosmic. He talks about how scientific laws may be modified when we go inside a collapsed star (I don't really mean "we" because our puny bodies couldn't handle the ride. He expresses the joy of our position in the universe and how we stand on the horizon of the unknown. I don't always get the more complex explanations when it comes to this advanced physics. I appreciate that this talks to me. He brings us the "ghosts" that are theoretically there. We are introduced to John Herschel, who was way ahead of time and is little known by most of us, and how he observed things that didn't become revised for many years.
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