PATRICK DUMAS / LOOK AT SCIENCES / SCIENCE PHOTO LIBRARY PATRICK DUMAS / LOOK AT SCIENCES / SCIENCE PHOTO LIBRARY
Herschel space telescope construction. Technicians checking the optical controls of the M1 mirror (circular, upper right) of the Herschel space telescope. 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 Astrium site of the European Aeronautic Defence and Space Company (EADS) in Toulouse, France.
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