Last month, work began on the world’s first space-based gravitational wave detector. The European Space Agency (ESA) and partner aerospace companies are developing orbiting detector spacecraft to observe gravitational waves from some of the universe’s most massive objects.The Laser Interferometer Space Antenna satellite constellation (LISA) will be three satellites orbiting the sun in a triangular formation, each separated from the other by 2.5 million kilometers, trailing 60 million km behind E...