A team of astronomers has for the first time discovered a collision between two neutron stars of substantially different masses, opening up a new sight on astrophysics and on the physics of gravity. The event proposes the first clear evidence from these faint space-time ripples that at least one neutron star was spinning before merging, giving astronomers rare insight into a key attribute of these dark objects. The neutron stars were identified last year and were uncovered on April 25, 2019, by the LIGO Livingston Observatory and now a new study validates that this event was indeed likely the outcome of a merger of two neutron stars.