Chapitre 146: Is This Rubbish…? - Part 2

Sigh, I hate to be doing this again so soon, but life has been throwing me around its ups and lows—please don't unlock this chapter.

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The theory of relativity usually encompasses two interrelated physics theories by Albert Einstein: special relativity and general relativity, proposed and published in 1905 and 1915, respectively.[1] Special relativity applies to all physical phenomena in the absence of gravity. General relativity explains the law of gravitation and its relation to the forces of nature.[2] It applies to the cosmological and astrophysical realm, including astronomy.[3]