Open Sesame! The doors of ESO’s Extremely Large Telescope (ELT) have moved for the first time. This was no small feat, as each door will weigh 650 tonnes once completed 🤯 The ELT dome and its doors will guard the telescope from the harsh conditions of the Atacama Desert. At night, they will open to allow it to scrutinise Chile’s uniquely dark skies. Discover more: https://www.eso.org/public/videos/potw2544a/ 📹 ESO/ACe | ESO Astronomy
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