Herschel space telescope construction

Herschel space telescope construction

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Caption: Herschel space telescope construction. Technician checking the quality of the aluminium coating used on the M1 mirror of the Herschel space telescope. Sample mirrors were placed in the metal-coating chamber at the same time as the M1 mirror. Here a technician is testing one (held in forceps) for its resistance to cycles of hot and cold temperatures. With its primary mirror measuring 3. 5 metres in diameter, the European Space Agency's Herschel telescope is the largest space telescope ever built; larger than the Hubble telescope which has a diameter of 2.4 metres. Photographed at the Calar Alto astronomical observatory, Spain.

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