A brief look at the Hubble Space Telescope's up-and-down journey over the past 19 years:
April 1990: Hubble launched aboard space shuttle Discovery.
June 1990: Hubble found to have blurred vision.
1993: Shuttle astronauts install corrective lenses.
1995: Hubble captures startling images of newborn stars emerging in Eagle Nebula.
1997: Second servicing mission.
1999: Third servicing mission.
2002: Fourth servicing mission.
2004: Planned fifth and final repair mission canceled in wake of 2003 Columbia tragedy.
2006: Mission reinstated.
2008: Mission postponed because of telescope breakdown.
2009: Space shuttle Atlantis poised to lift off on final repair mission after seven-month delay.
Early 2020s: Planned demise of Hubble with plunge over Pacific.
