To celebrate the Hubble Space Telescope's two decades in orbit, we've compiled 20 of our favorite Hubble photos in this collection.
Hubble was launched April 24, 1990, aboard space shuttle Discovery, NASA said, noting Hubble's discoveries have revolutionized nearly all areas of current astronomical research, from planetary science to cosmology.
Although the space telescope has had several technical problems, the space agency said Hubble scientists, engineers and NASA astronauts were able to upgrade the instrument and it now is 100 times more powerful than when it was launched.
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