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          A chronology of the Hubble Space Telescope Illustrates the mission's history from conception through its 25 years of ground-breaking observations and discoveries.
          Significant Image
          The Cygnus Loop supernova remnant (Veil Nebula)
          The Cygnus Loop supernova remnant (Veil Nebula)
          Release date: January 6, 1993

          This is an image of a small portion of the Cygnus Loop supernova remnant, taken with the Wide Field and Planetary Camera. The Cygnus Loop marks the edge of a...

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          hubbleSite press relese
          Science Discovery
          Double nucleus discovery
          Double nucleus discovery
          Release date: January 7, 1993

          A double nucleus is revealed in the core of active galaxy Markarian 315.

          OBJECT: Markarian 315, a so-called Seyfert galaxy

          CREDIT: J. MacKenty (STScl),...

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          HubbleSite press release
          Historical Context
          First Keck Observatory opens
          First Keck Observatory opens
          March 1993

          Keck 1, first of the twin Keck telescopes, begins science operations atop Mauna Kea in Hawaii. Keck 2 opens in January, 1996. Both are 10-meter (33 ft)...

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          About the Keck Observatory
          Mission Event
          First Servicing Mission (STS-61)
          First Servicing Mission (STS-61)
          December 2-13, 1993

          As their main objective, mission astronauts install two devices—the Corrective Optics Space Telescope Axial Replacement (COSTAR), and the Wide Field...

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          NASA Space Shuttle Endeavour Mission STS-61: Hubble Servicing Mission 1
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