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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
First light at the Subaru Telescope
First light at the Subaru Telescope
January 1999

First scientific observations begin at the 8.2-m optical/infrared Subaru Telescope on Mauna Kea, Hawaii. Subaru is an Ritchey-Chretien reflecting telescope...

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NAOJ Subaru Telescope
Historical Context
Gemini North observatory is completed
Gemini North observatory is completed
January 1999

The Gemini Observatory consists of twin 8.1-meter (26.58 feet) diameter optical/infrared telescopes. Gemini North (the Frederick C. Gillett Gemini Telescope)...

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About the Gemini Observatory
Historical Context
NASA launches first mission to return extraterrestrial material beyond Earth's moon
NASA launches first mission to return extraterrestrial material beyond Earth's moon
February 7, 1999

Stardust is the first U.S. mission dedicated solely to a comet and was the first to return extraterrestrial material from outside the orbit of the moon....

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NASA Stardust mission
Science Discovery
Hubble Constant refined
Hubble Constant refined
Release date: May 25, 1999

Hubble observations allow astronomers to refine the universe’s expansion rate to within 10 percent accuracy.

OBJECT: NGC 4603

CREDIT: J. Newman (Univ....

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HubbleSite press release
Significant Image
A closer encounter with Mars
A closer encounter with Mars
Release date: June 30, 1999

Astronomers using the Hubble telescope take the sharpest views yet of the Red Planet during its closest approach to Earth in eight years. Dark sand dunes...

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HubbleSite press release
Historical Context
Chandra X-ray Observatory is launched
Chandra X-ray Observatory is launched
July 23, 1999

The third member of the Great Observatory family, the Chandra X-Ray Observatory (CXO), is deployed from a Space Shuttle and boosted into a high-Earth orbit....

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NASA Mission: Chandra X-ray Observatory
Mission Event
Hubble is placed in safe mode
November 13, 1999

Since the second Servicing Mission in February 1997, three of Hubble’s six gyroscopes had failed, causing some concern among NASA officials. At the time,...

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Mission Event
Servicing Mission 3A (STS-103)
Servicing Mission 3A (STS-103)
December 19-27, 1999

In Part A of the two-part Third Servicing Mission, astronauts replaced the telescope’s six gyroscopes, which help the orbiting observatory point at celestial...

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NASA Space Shuttle Discovery Mission STS-103: Hubble Servicing Mission 3A
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