The sealed ELT time capsule

This image shows the time capsule of ESO’s Extremely Large Telescope, covered with a one-fifth-scale model of one of the ELT’s primary mirror segments. The time capsule, which commemorates ESO staff, science, technology and cooperation between ESO and Chile, was sealed at the telescope’s first-stone ceremony, in 2017, and buried on its concrete on 13 October 2023.