A pair of supermassive black holes are about 40 orbits from merging in this computer simulation. [Full Story](https://www.space.com/astronomy/black-holes/the-beacons-were-lit-scientists-name-merging-supermassive-black-holes-after-lord-of-the-rings-locations) Credit: NASA’s Goddard Space Flight Center/Scott Noble; simulation data, d'Ascoli et al. 2018 | edited by Space.com