Space Missions for Gravitational Waves

The Laser Interferometer Space Antenna (LISA) or Evolved LISA (eLISA) is a proposed space probe by the European Space Agency designed to detect and accurately measure gravitational waves. The mission architecture comprises three spacecraft arranged in an equilateral triangle with arms millions of kilometers long, using laser interferometry. > One-line conceptual takeaway: eLISA aims to detect gravitational waves from space by measuring minuscule distance changes between three widely separated spacecraft using lasers. Answer: (d).