The experiment described refers to the Evolved Laser Interferometer Space Antenna (ELISA), which is designed to detect gravitational waves by measuring minute changes in distance between spacecraft positioned in a triangular formation over vast distances. This setup is significant in astrophysics as it allows for the precise measurement of gravitational waves from cosmic events, thereby enhancing our understanding of the universe's structure and dynamics. The concept aligns with UPSC Prelims GS Paper I as it encompasses advancements in space science and technology, highlighting the intersection of physics and astronomy in modern research.