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Gravitational waves were first proposed in 1915 as part of Albert Einstein's theory of gravity, known as general relativity.—Robert Lea, Space.com, 1 June 2026 The distance is measured to within a few millimeters, enabling strong tests of general relativity.—Encyclopedia Britannica, 14 May 2026 Einstein’s general relativity explains gravity, black holes, and the motion of massive objects across the universe.—Rupendra Brahambhatt, Interesting Engineering, 9 May 2026 In general relativity, spacetime is a changing, dynamic background.—Big Think, 1 May 2026 See All Example Sentences for general relativity