Binary Stars' Gravitational Waves

https://en.wikipedia.org/wiki/Gravitational_wave

Gravitational waves are transient displacements in a gravitational field – generated by the relative motion of gravitating masses – that radiate outward from their source at the speed of light.[1] They were first proposed by Oliver Heaviside in 1893 and then later by Henri Poincaré in 1905 as the gravitational equivalent of electromagnetic waves.[2] In 1916,[3][4] Albert Einstein demonstrated that gravitational waves result from his general theory of relativity as ripples in spacetime.