Europe’s ultra-powerful new WEAVE telescope, undergoing its inaugural ‘first-light’ instrument activation, recorded a collision between galaxies in a region of deep space called Stephan’s Quintet, where one of the galaxies was traveling at two million miles per hour. Designed to study the composition of stars and galaxies, the William Herschel Telescope is a 20-million Euro collaboration between France, Italy, the UK, the Netherlands, and Spain, with the latter hosting the actual facility in La Palma. The facility’s Enhanced Area Velocity Explorer (WEAVE) wide-field spectrograph’s Large Integral Field Unit (LIFU) is the first of the telescope’s instruments to be activated and...