Hubble Space Telescope Launched into Orbit

Context

Astronomers had long recognized that Earth's atmosphere limited the clarity and range of ground-based telescopes, blocking ultraviolet and much of the infrared spectrum while causing starlight to twinkle. In 1946, astrophysicist Lyman Spitzer outlined the scientific advantages of an orbiting observatory in a paper that shaped decades of planning. NASA pursued the concept through the 1960s and 1970s, with Nancy Grace Roman serving as a key advocate and program scientist who helped secure congressional support.

What Happened

After years of design work involving NASA centers, the European Space Agency, and contractors such as Lockheed and Perkin-Elmer, the Hubble Space Telescope was completed and prepared for flight despite repeated schedule slips. The 1986 Challenger disaster further postponed launch until the shuttle fleet returned to service. On April 24, 1990, Discovery lifted off from Kennedy Space Center's Launch Complex 39B at 12:33:51 UTC during the STS-31 mission, carrying the 11-ton telescope in its payload bay. The five-member crew—Commander Loren Shriver, Pilot Charles Bolden, and Mission Specialists Bruce McCandless II, Steven Hawley, and Kathryn D. Sullivan—reached a high orbit of roughly 613 by 615 kilometers.

Aftermath

The following day, Hawley used the shuttle's robotic arm to release Hubble into its operational orbit. A minor issue with one solar array was resolved by ground controllers, allowing full deployment without a spacewalk. Discovery landed at Edwards Air Force Base on April 29 after completing experiments and photography, marking the successful start of Hubble's mission.

Legacy

Hubble quickly demonstrated the power of space-based astronomy, delivering images that transformed understanding of galaxies, star formation, and the universe's expansion rate despite an initial mirror flaw later corrected by servicing missions. The project proved the value of maintainable observatories and international collaboration, inspiring public interest in science and paving the way for successors such as the James Webb Space Telescope.