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Happy 25th Anniversary, Hubble Space Telescope!

Credit: NASA
Friday, April 24, 2015: Workers at the Perkin-Elmer company view Hubble Space Telescope's primary, 8-foot (2.4 m) mirror in a photo dated June 6, 1984.…Read More »

The telescope launched into space on April 24, 1990. Hubble’s main mirror reflects light onto a smaller, secondary mirror which sends the light back through a two-foot (0.6 m) hole in the center of the main mirror to instruments that collect the scientific data. The hole is covered here. Famously, the main mirror suffered from flaws that made the telescope unable to provide clear images until astronauts made repairs on-orbit. Today, after 25 years in space, Hubble continues contributing to discoveries revolutionizing the field of astronomy. [See related article.]

— Tom Chao    Less «
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