The De Sitter double star experiment is a thought experiment proposed by the Dutch astronomer Willem de Sitter in the early 20th century. It is intended to illustrate aspects of general relativity, particularly the effects of gravity on light and the concept of gravitational wave propagation. In this experiment, assume there are two massive bodies (the "double stars") orbiting around each other. According to general relativity, massive objects curve spacetime, affecting the paths of nearby light rays.
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