PATRICK DUMAS / LOOK AT SCIENCES / SCIENCE PHOTO LIBRARY PATRICK DUMAS / LOOK AT SCIENCES / SCIENCE PHOTO LIBRARY
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. 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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