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The TMT Multi-Segment Integration & Test (MSIT) facility, fully populated with seven full-size aluminum segments, at the Monrovia laboratory, on February 11, 2020.

March 6th, 2020

Credit: TMT International Observatory, LLC

Fabricated by TMT-Japan, MSIT recreates a subset – approximately 1/70th - of the TMT primary mirror cell, and the segments it carries accurately recreate the unique hexagonal forms of the seven segments that will exist in the telescope in the same positions. Mirror segments in TMT are of 82 types – each one very slightly different – arranged in six identical sectors. MSIT contains segments from sectors D and E of the primary mirror.