Extraordinary precautions were taken to keep the Hubble Space Telescope clean during assembly and checkout before flight. The chamber where it was kept was thousands of times cleaner than a typical laboratory. Temperature, humidity, and airflow were precisely controlled, and the air was filtered. This January 1985 photo shows Hubble being assembled in the clean room at Lockheed Martin in Sunnyvale, California. The Optical Telescope Assembly (OTA) is being readied for the installation of the aft shroud. The OTA contains the two mirrors, primary and secondary, necessary to collect and focus ligh

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Photo credit: © NG Images / Alamy / Afripics
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Keywords: 25th, anniversary, hubble, launch, nasa, rocket, space, telescope