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Blank annealing
Opening of the ELT M2 blank mold containing the still extremely hot Zerodur glass, following first annealing at the Schott 4 meter blank annealing facility in Mainz, Germany, earlier this month. The completed mirror will weigh 3.5 tonnes, be the largest secondary mirror ever employed on a telescope, and also the largest convex mirror ever produced. Photo: ESO/Schott.
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