In a recent interview, Astrophysicist Dr. Karen Tong discussed the evidence for the existence of gravitational waves. According to Dr. Tong, the evidence for gravitational waves comes from two sources: the indirect detection of gravitational waves and the direct detection of them. Indirect detection relies on observations of binary systems, such as two stars orbiting each other. By carefully measuring the orbital parameters of these binary systems, scientists are able to detect any changes in the orbits that would be caused by the emission of gravitational waves by the system. Direct detection involves using sensitive detectors to measure the tiny vibrations in space-time that are caused by the passing of gravitational waves. According to Dr. Tong, both of these methods have provided strong evidence for the existence of gravitational waves.

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source: Phys.org