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Last updated on April 20, 2014 at 14:04 EDT
Herschel spacecraft during distance measurements between the
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Herschel spacecraft during distance measurements between the primary and secondary mirrors

March 5, 2009
The Herschel telescope during the high-precision measurements of the distance between the primary and secondary mirrors (M1 and M2), with the spacecraft in horizontal position. The operator can be seen placing laser targets at the rear of the M2 (secondary mirror).