In the field of physics, relativity improved the science of elementary particles and their fundamental interactions, along with ushering in the nuclear age. It introduced concepts including 4- dimensional spacetime as a unified entity of space and time, relativity of simultaneity, kinematic and gravitational time dilation, and length contraction. The theory transformed theoretical physics and astronomy during the 20th century, superseding a 200-year-old theory of mechanics created primarily by Isaac Newton. It applies to the cosmological and astrophysical realm, including astronomy.
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General relativity explains the law of gravitation and its relation to the forces of nature. Special relativity applies to all physical phenomena in the absence of gravity. The theory of relativity usually encompasses two interrelated physics theories by Albert Einstein special relativity and general relativity, proposed and published in 19, respectively.
Video simulation of the merger GW150914, showing spacetime distortion from gravity as the black holes orbit and merge
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