ELT M1 segment assembly in final inspection

Once segments of the Extremely Large Telescope’s (ELT's) primary mirror, M1, have been polished, they’re mounted on a support system just like this one. Final inspection of the support is happening here, at the Safran Reosc facilities in France, prior to delivery to Chile, where the telescope is under construction in the Atacama Desert. Together, each mirror segment on ESO’s soon-to-be biggest eye on the sky and their supports will weigh 250 kilograms.