LISA Pathfinder will be a group of three spacecraft

LISA Pathfinder is testing the technologies needed, in space flights, for future space mission aiming at improving our knowledge of the universe by detecting gravitational waves for the very first time, a phenomenon predicted by Einstein’s theory of general relativity in 1915.

Laser Interferometer Space Antenna (LISA) scheduled to launch in 2034, will be a group of three spacecraft that are designed to search for gravity waves. The LISA spacecraft will be placed at the corners of an equilateral triangle with sides of approximately five million km (three million miles).

LISA Pathfinder was a European Space Agency space mission that successfully tested the technology necessary for the Laser Interferometer Space Antenna (LISA).