November - Rendering of the M2 mirror in position on the ELT telescope
You can pre-order the calendar from the ESOshop. Deliveries will start in the second half of November 2019.
This image shows an artist’s impression of the M2 mirror in position on ESO’s Extremely Large Telescope (ELT). Designed and manufactured by the SENER group (Spain), the mirror will be 4.2 metres in diameter with a convex shape. The total weight of the M2 system will be close to 12 tonnes.Credit: