They want to do this in space: https://en.wikipedia.org/wiki/Evolved_Laser_Interferometer_Space_Antenna https://en.wikipedia.org/wiki/Evolved_Laser_Interferomet

They want to do this in space: https://en.wikipedia.org/wiki/Evolved_Laser_Interferometer_Space_Antenna https://en.wikipedia.org/wiki/Evolved_Laser_Interferometer_S... Funding is limited though, and doing it on the ground is easier to develop and maintain/troubleshoot.