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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
Evidence is published that the expansion rate of the universe is accelerating
Evidence is published that the expansion rate of the universe is accelerating
1998

Two teams of astronomers—the High-z Supernova Search Team, led by Adam Riess and Brian Schmidt, and the Supernova Cosmology Project, led by Saul...

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Science Discovery
Hubble provides a clear image of Saturn's aurora
Hubble provides a clear image of Saturn's aurora
Release date: January 7, 1998

Saturn image, taken by the Hubble telescope in ultraviolet light, reveals glowing, swirling material at Saturn's poles rising more than a thousand miles...

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HubbleSite press release
Science Discovery
Preliminary evidence for an accelerating universe
Preliminary evidence for an accelerating universe
Release date: January 8, 1998

These Hubble Space Telescope images pinpoint three distant supernovae, which exploded and died billions of years ago. Scientists are using these faraway...

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HubbleSite press release
Historical Context
The first Very Large Telescope (VLT) array opens
The first Very Large Telescope (VLT) array opens
First Light: May 25, 1998

The first of the European Southern Observatory's four Very Large Telescope (VLT) arrays, Antu, opens at Cerro Paranal in Chile. The large reflecting...

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ESO's Very Large Telescope
Significant Image
Close-up view of Galaxy NGC 4314
Close-up view of Galaxy NGC 4314
Release date: June 11, 1998

This Hubble telescope snapshot reveals clusters of infant stars that formed in a ring around the core of the barred-spiral galaxy NGC 4314.

OBJECT: NGC...

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HubbleSite press release
Mission Event
HOST Mission (STS-95)
HOST Mission (STS-95)
October 29-November 7, 1998

Among several STS-95 mission objectives, the Hubble Space Telescope Orbiting Systems Test (HOST) carries out experiments on instruments planned for Hubble...

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NASA Space Shuttle Discovery Mission STS-95
Historical Context
Assembly of the International Space Station begins
Assembly of the International Space Station begins
November 20, 1998

The first International Space Station assembly Mission, ISS Assembly Mission 1 A/R, was launched atop a Russian Proton rocket carrying the Zarya Control...

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International Space Station: Zarya
Pre-launch - 1990 - 1991 - 1992 - 1993 - 1994 - 1995 - 1996 - 1997 - 1998 - 1999 - 2000 - 2001 - 2002 - 2003 - 2004 - 2005 - 2006 - 2007 - 2008 - 2009 - 2010 - 2011 - 2012 - 2013 - 2014 - 2015