If you can't make out the words on street signs, you correct your vision by wearing glasses. If NASA sends up a multi-billion-dollar telescope that can't make out the stars in galaxies, well—it corrects its vision with glasses, too. In essence, anyway. That's what happened with the Hubble Space Telescope: it wore "glasses" for more than 15 years.
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Key Facts In This Video
Hubble was launched with an irregularly shaped mirror that kept it from being able to focus properly. 00:43
In 1993, NASA equipped Hubble with what amounts to eyeglasses, correcting its "vision" and allowing it to capture crystal clear images of the universe. 01:08
Over the years, the Hubble Telescope has sent back many images, including highlights such as The Pillars of Creation, Comet Shoemaker-Levy 9, and the Deep Field image. 01:28