SXS— Simulating eXtreme Spacetimes —is an ongoing scientific collaboration that has been generating simulations of dramatic events in space, particularly mergers of binary black hole systems, for several decades. Recently, SXS published a paper describing version 3 of its catalog of binary black hole simulations, six years after releasing version 2. In 2015, LIGO (the Laser Interferometer Gravitational-wave Observatory) first successfully observed gravitational waves —ripples in space-time