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Schott Casts First Segments for ESO’s Extremely Large Telescope

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MAINZ, Germany, Jan. 31, 2018 — The first six hexagonal segments for the main mirror of the European Southern Observatory’s (ESO’s) Extremely Large Telescope (ELT) have been successfully cast by glass manufacturer Schott AG at its facility in Mainz. The segments will form parts of the ELT’s 39-m main mirror, which will have 798 segments in total when completed. The ELT will be the largest optical telescope in the world when it sees first light in 2024. The primary mirror of the telescope will be the largest ever made for an optical IR telescope. The segments will work together as a single huge mirror...Read full article

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    Published: January 2018
    Glossary
    glass
    A noncrystalline, inorganic mixture of various metallic oxides fused by heating with glassifiers such as silica, or boric or phosphoric oxides. Common window or bottle glass is a mixture of soda, lime and sand, melted and cast, rolled or blown to shape. Most glasses are transparent in the visible spectrum and up to about 2.5 µm in the infrared, but some are opaque such as natural obsidian; these are, nevertheless, useful as mirror blanks. Traces of some elements such as cobalt, copper and...
    BusinessEuropean Southern ObservatoryESOExtremely Large TelescopeELTSCHOTTMaterialsglassOpticslensesEurope

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