Timeline
Year
Event
1946
The astronomer Lyman Spitzer writes a report on the advantages of an extra-terrestrial observatory.
1977
The American congress approves the funding for the Large Space Telescope.
1978
Astronauts begin the training for space telescope missions.
1979
Work begins on the 2.4-metre main mirror of the telescope.
1981
The Space Telescope Science Institute (STScI) begins its operations on the campus of the John Hopkins University in Baltimore, USA.
1983
The Large Space Telescope is renamed the Hubble Space Telescope, after the renowned astronomer Edwin Powell Hubble, who proved the existence of other galaxies and discovered the first evidence for an expanding Universe.
1984
The Space Telescope-European Coordinating Facility begins its operation in Garching at Munich, Germany.
1985
The work on building Hubble is completed.
1986
Hubble’s launch is delayed after the Challenger disaster, which puts all shuttle flights on hold.
1990
The shuttle Discovery (STS-31) is launched on 24 April 1990 and brings Hubble into space. On 25 April Hubble is deployed into its orbit by the space shuttle crew.
The first images made on 25 June reveal that the main mirror of Hubble has a spherical aberration which causes all images to be blurred.
Within the same year COSTAR is approved: This instrument is a complex package of five optical mirror pairs which are going to rectify the spherical aberration of Hubble’s main mirror.
1993
The space shuttle Endeavour is launched on 2 December to conduct the First Servicing Mission on Hubble. During the mission the corrective optics of COSTAR are installed which replace the High Speed Photometer. The WFPC2 (Wide Field and Planetary Camera 2), which was built with its own corrective optics, replaced the WFPC1 (Wide Field and Planetary Camera 1).
1994
Hubble provides detailed observations of the comet Shoemaker–Levy 9 as it collides with the planet Jupiter [1]. In addition, by observing the galaxy M87 Hubble provides conclusive evidence for the existence of Supermassive Black Holes in the centres of galaxies [2].
1995
Hubble takes the famous photo of the Eagle Nebula which later will be called “the pillars of creation” [3] .
1996
The first Hubble Deep Field, which was observed by the end of 1995, is revealed and allows astronomers to study galaxies in the early Universe [4]. In the same year Hubble resolves the host galaxies of quasars [5].
1997
Servicing Mission 2 (STS-82) is launched on 11 February. The crew of the space shuttle Discovery replace the instruments FOS (Faint Object Spectrograph) and GHRS (Goddard High Resolution Spectrograph) with STIS (Space Telescope Imaging Spectrograph) and NICMOS (Near Infrared Camera and Multi-Object Spectrograph). Within 1997 Hubble also observes the visible afterglow of a gamma-ray burst in a distant galaxy [6].
1998
On 29 October the HST Orbital System Test (HOST) is launched with the space shuttle Discovery (STS-95). The HOST mission is testing new technologies to be used in Hubble on the third Servicing Mission and beyond.
1999
The Servicing Mission 3A (STS-103) is launched on 19 December. The astronauts on board the Discovery replace the six gyroscopes of the telescope, which help it pointing at celestial objects, and conduct a general maintenance. This is the first servicing mission which is not replacing any older science instruments.
2002
The Servicing Mission 3B is launched on 1 March. During the Mission the ACS (Advanced Camera for Surveys), the NICMOS Cooling System (NCS) and new solar panels are installed. Hubble also detects an object in the Kuiper belt at the edge of our Solar System which is larger than Pluto [8]. This discovery leads to a debate on Pluto's status as a planet.
2003
The space shuttle Columbia disintegrates during the atmospheric re-entry, no crew members survive and the shuttle programme is grounded.
2004
The Hubble Ultra Deep Field is released allowing astronomers to look even further back in the time of the cosmos [9]. Another servicing mission is cancelled out of concern for shuttle safety and the power supply on STIS (Space Telescope Imaging Spectrograph) fails.
2007
Hubble observations show that the dwarf planet Eris is bigger than Pluto [12]. A 3D-map, based on images by Hubble, showing the distribution of dark matter in the Universe is revealed [13]. Also in 2007 the power supply on the Advanced Camera for Surveys, one of Hubble’s key instruments, fails.
2008
Hubble takes a picture of the exoplanet Formalhaut b, the first visual image of an exoplanet [14]. In the same year Hubble finds organic molecules on an extrasolar planet and the telescope’s 100 000th orbit around Earth is celebrated [15].
2009
Servicing Mission 4 (STS-125) is launched on 11 May [16]. The astronauts install two new instruments, WFC3 (Wide Field Camera 3) and COS (Cosmic Origins Spectrograph) which make Hubble 100 times more powerful than when it was launched. During the servicing mission the damaged instruments are repaired, the gyroscopes and batteries are replaced, and the Soft Capture Mechanism as well as NBLs (New Outer Blanket Layers) are installed.
2010
Hubble images reveal distant galaxies with likely redshifts greater than 8, showing the Universe as it was when it was less than a tenth of its current age [17]. Hubble also photographs a never-before-seen evidence of a collision between two asteroids [18].
2011
Hubble makes its millionth observation, a spectroscopic analysis of the exoplanet HAT-P-7b. The 10 000th scientific paper using Hubble data is published [19].
2012
Images taken by Hubble show seven primitive galaxies from a distant population that formed more than 13 billion years ago. The galaxies are seen as they were when the Universe was less than 4 percent of its present age. Later in the year even that record is broken as Hubble finds an object back from a time when the Universe was only 3 percent of its present age, only 470 million years after the Big Bang [20]. Hubble observations also lead to a new class of exoplanet [21].
2013
Hubble is also used in this year to determine for the first time the true colour of a planet orbiting another star [22] and finds water vapour erupting off the surface of Jupiter’s moon Europa [23].
2014
Hubble becomes the first telescope ever to observe an asteroid disintegrating [24] and it reveals the most detailed weather map for an exoplanet ever [25].
2015
Hubble observes, for the first time, four images of a distant exploding star arranged in a cross-shaped pattern by the powerful gravity of a foreground galaxy embedded in a massive cluster of galaxies [26]. It also celebrates its 25th year in orbit with celebrations across the globe! [27] [28].