ESPRESSO makes ESO’s VLT the largest optical telescope in the world
The ESPRESSO spectrograph, partially built by Instituto de Astrofísica e Ciências do Espaço (IA), has used the combined light of all four of the 8.2-metre Unit Telescopes for the first time. Combining light from the Unit Telescopes in this way makes the VLT the largest optical telescope in existence in terms of collecting area.
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