For one we didn't have a way to measure the speed of gravitational waves before [1]. [1] https://physics.stackexchange.com/questions/622729/did-ligo-measuremen

For one we didn't have a way to measure the speed of gravitational waves before [1]. [1] https://physics.stackexchange.com/questions/622729/did-ligo-measurements-prove-that-the-speed-of-gravity-equals-the-speed-of-light https://physics.stackexchange.com/questions/622729/did-ligo-...