Quantum mechanics and relativity are fundamental to understanding the universe from "summary" of Astrophysics for People in a Hurry by Neil deGrasse Tyson
Quantum mechanics and relativity are the twin pillars upon which our understanding of the universe stands. Quantum mechanics deals with the behavior of particles on the smallest scales, where the laws of classical physics no longer apply. It explains the bizarre phenomena that occur at the subatomic level, such as particles existing in multiple states at once or instantly influencing each other regardless of distance. On the other hand, relativity is the theory that describes the behavior of objects moving at high speeds or in strong gravitational fields. It revolutionized our understanding of space and time, showing that they are not absolute but are intertwined in a four-dimensional fabric known as spacetime. Relativity predicts phenomena such as time dilation, where time passes differently for observers in different frames of reference. When combined, quantum mechanics and relativity form the...
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