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With the telescope at Mt. Wilson Observatory astronomer Edwin Hubble measures the distances and velocities of galaxies—work that led to his discovery of the expanding Universe. -
Astrophysicist Lyman Spitzer, Jr., published a paper introducing the idea of a large space telescope. At the time, no satellite had yet been launched into orbit. -
After the launch of Sputnik 1 by the Soviet Union in 1957, Congress passed the Space Act in July 1958. The Space Act created the National Aeronautics and Space Administration. It came into effect on October 1, 1958. -
Astrophysicists and engineers held their first working group meeting for the Large Space Telescope. Concepts for the space telescope, as well as budget and technical requirements for the spacecraft were developed. -
Funding for the Large Space Telescope project, approved by the United States Congress earlier in 1977, took affect and the project officially began. -
Preliminary grinding work began on the 2.4-meter (7.9-foot) primary mirror for the Large Space Telescope. Grinding a telescope’s mirror shapes it so that it focuses incoming light from astronomical targets. -
The Large Space Telescope was renamed in honor of astronomer Edwin Hubble, for his discovers of the universe. -
Space shuttle Discovery launched from the Kennedy Space Center in Florida, carrying five astronauts and the Hubble Space Telescope. -
The first image from the Hubble Space Telescope highlights the advantage of photographing stars from above Earth's atmosphere. -
Hubble observed the remnants of Supernova 1987A. In unprecedented detail, Hubble revealed characteristics in a shell of material surrounding the supernova. -
Astronomers using Hubble had detected the rare element boron in an ancient star. This discovery suggested that the element boron might have been evidence of energetic events that occurred with the birth of our Milky Way galaxy. -
The primary mission of Servicing Mission 1 was to install two new instruments on Hubble. The first was the Wide Field and Planetary Camera 2. The second instrument was the Corrective Optics Space Telescope Axial Replacement (COSTAR). Following the success of SM1, observations from the Hubble Space Telescope were no longer “blurry.” -
Hubble observations confirmed the existence of supermassive black holes at the centers of galaxies. -
Images of newborn stars emerging from dense pockets of interstellar gas in the Eagle Nebula. -
The goals of Servicing Mission 2 included the installation of the Near Infrared Camera and Multi-Object Spectrometer (NICMOS) and the Space Telescope Imaging Spectrograph (STIS). -
Astronomers using Hubble published the first evidence that the expansion of the universe is not slowing down, as expected, but accelerating. The results were based on distance measurements to supernovae located so far away that they allowed astronomers to determine the expansion rate of the universe. -
Hubble was put into “safe mode” after the failure of a fourth gyroscope. -
Hubble’s third servicing mission was split into two following the spacecraft’s gyroscope failures and its immediate need for servicing. The primary goals of space shuttle Discovery’s seven astronauts was to restore Hubble to working order and upgrade its systems. Astronauts installed a new computer as well as all new gyroscopes. -
Astronomers released pictures from Hubble that provided the first direct visual evidence of planetary “building blocks” within dusty disks around young stars. The “protoplanetary disks” are located in the Orion Nebula approximately 1,500 light-years from Earth. -
The second part of servicing mission 3. Servicing Mission 3B was aimed at updating Hubble. -
space shuttle Columbia disintegrated upon reentering Earth’s atmosphere after a 15-day mission in space, killing all seven astronauts on board. -
Hubble’s fifth servicing mission (Servicing Mission 4) was officially canceled. The cancellation followed the Columbia disaster of February 2003 and publication of the final report from the accident’s review board. -
Astronomers using Hubble, NASA’s Chandra X-ray Observatory and ground-based telescopes released direct proof of dark matter in the galaxy cluster 1E 0657-56, also known as the Bullet Cluster. -
Hubble’s fifth servicing mission was reinstated as STS-125, during which space shuttle astronauts would visit the telescope to extend the life of the observatory and improve its scientific capabilities. The Hubble Telescope is still in use today making great discoveries