Artist’s impression of a neutron star-black hole merger event. (Carl Knox/OzGrav/Swinburne University) For the first time, scientists have unambiguously confirmed the collision of a black hole and a neutron star: The fateful moment two extreme objects come together in an event so immensely powerful, its ripples across the cosmos can still be discerned a billion years later. Amazingly enough, this astronomical discovery has now been made not once, but twice, as an international collaboration of thousands of scientists reports. In a new study confirming this world-first observation, researchers detail the detection of gravitational waves resulting from two separate and distinct...