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          Banner Timeline
          A chronology of the Hubble Space Telescope Illustrates the mission's history from conception through its 25 years of ground-breaking observations and discoveries.
          Historical Context
          The first Mars rover lands on the Red Planet
          The first Mars rover lands on the Red Planet
          January 3, 2004

          NASA's twin Mars Exploration Rovers, Spirit and Opportunity, launched toward Mars on June 10 and July 7, 2003, in search of answers about the history of...

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          NASA Mission: Spirit and Opportunity
          Mission Event
          Servicing Mission 4 is canceled
          January 16, 2004

          NASA Administrator, Sean O’Keefe, cancels planned Hubble servicing mission out of concern for shuttle safety.

          Science Discovery
          Hubble makes the Ultra-Deep Field observation
          Hubble makes the Ultra-Deep Field observation
          Release date: March 9, 2004

          Nearly 10,000 galaxies in this image represent a "deep" core sample of the universe, cutting across billions of light-years. The smallest, reddest galaxies...

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          HubbleSite press release
          Historical Context
          Cassini-Huygens mission arrives at Saturn
          Cassini-Huygens mission arrives at Saturn
          July 1, 2004

          The Cassini spacecraft arrives at Saturn, marking the end of the spacecraft's journey through the solar system and the beginning of its tour of Saturn's...

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          NASA Missions: Cassini-Huygens
          Significant Image
          The Cat's Eye Nebula
          The Cat's Eye Nebula
          Release date: September 9, 2004

          The Cat's Eye Nebula reveals the full beauty of a bull's eye pattern of eleven or even more concentric rings. Each "ring" is actually the edge of a spherical...

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          HubbleSite press release
          Science Discovery
          Hubble refines the distance to the Pleiades star cluster
          Hubble refines the distance to the Pleiades star cluster
          Release date: June 4, 2004

          The Pleiades is an open cluster, which contains up to several thousand stars distributed in a region a few light-years across. By measuring slight changes in...

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          HubbleSite press release
          Historical Context
          Launch of the Swift satellite
          Launch of the Swift satellite
          November 20, 2004

          The Swift Gamma-Ray Burst Mission was launched into a low-Earth orbit on a Delta 7320 rocket as part of NASA's medium explorer (MIDEX) program.

          NASA’s...

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          NASA Science Missions: SWIFT
          Science Discovery
          Helix Nebula
          Helix Nebula
          Release date: December 16, 2004

          The Helix is a planetary nebula, the glowing gaseous envelope expelled by a dying, sun-like star. The Helix resembles a simple doughnut as seen from Earth....

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          HubbleSite press release
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