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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
Hubble views a major storm on Saturn
Hubble views a major storm on Saturn
Release date: January 17, 1991

A great storm in the equatorial region of Saturn is discovered by amateur astronomers in September, 1990. Hubble's observing schedule is reprogrammed to...

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Hubble press release
Historical Context
CGRO mission is launched
CGRO mission is launched
April 5, 1991

The Compton Gamma Ray Observatory ( CGRO) launches as the second of NASA's Great Observatories. Compton carries a collection of four instruments, which...

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NASA Science Missions: CGRO
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Hubble's first observation of Jupiter
Hubble's first observation of Jupiter
Release date: May 17, 1991

This black and white picture of Jupiter is the first of many Hubble observations recording the detailed evolution of Jovian weather.

OBJECT:...

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HubbleSite press release
Historical Context
First spacecraft visits an asteroid
First spacecraft visits an asteroid
October 29, 1991

This first image of asteroid 951 Gaspra is taken by the Galileo spacecraft from a distance of 16,200 kilometers (10,000 miles) as it flies by the asteroid on...

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NASA Galileo Mission
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