File:Grinding the ELT’s M3 mirror (20230831 162758).jpg

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English: The Extremely Large Telescope’s (<a style="text-decoration: none;" href="https://elt.eso.org/">ELT's</a>) tertiary mirror, M3, is four metres in diameter and weighs in at a whopping three tonnes. Here, the M3 mirror is in the grinding phase at Safran Reosc in France, which is designed to improve the surface quality to an accuracy of a few micrometres. Following this stage, the mirror will be polished to an accuracy of a few nanometres.
Date 27 November 2023, 14:21:00 (upload date)
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This media was produced by the European Southern Observatory (ESO), under the identifier 20230831_162758

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Author Safran
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