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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.
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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