In a groundbreaking paper, a team of astrophysicists has introduced a new space gravitational wave observatory design called LAGRANGE. This innovative design promises to maintain the important LISA science while reducing costs and technical risks. The observatory consists of three drag-free spacecraft positioned at the Earth-Moon L3, L4, and L5 Lagrange points, ensuring continuous contact with Earth through fixed antennas. The core of the observatory is the Modular Gravitational Reference Sensor, which utilizes advanced optical technology and heritage from previous missions. The team plans to qualify critical technologies through small satellite flights, starting with the UV-LED Sat in 2013.
https://arxiv.org/abs/1111.5264