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May 28, 2023



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Installation of the first segment of the Gran Telescopio CANARIAS (GTC) primary mirror


On the way of its First Light, the collecting surface of the GTC, formed by 36 segments, begins to be a primary mirror.

Made up of 36 hexagonal ceramic mirrors - each 8 cm thick, 470 kg in weight and measuring 1.9 m from vertex to vertex, the primary mirror will always function as a single, quasi-hexagonal surface. Measuring 11.3 m across (the same size as a 10.4 m diameter circular mirror), there will be a gap of less than 3 mm between each of the primary mirror’s segments.

The first pieces of this jigsaw were installed last week.

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Natalia R. Zelman

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