HET Gallery
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mirror segment
Thomas A. Sebring

HET 001
The 91 hexagonal segments of the primary mirror were fabricated of Schott Zerodur, a glass ceramic that does not change size with temperature. In one of the countless strategies employed to reduce costs, many of the segments are fragments of blanks broken during the development of eight meter mirrors for the European Southern Observatory's Very Large Telescope.



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14 May 2003
Astronomy Program · The University of Texas at Austin · Austin, Texas 78712
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