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NASA's Hubble Space Telescope has made over one million observations during its more than two decades in orbit. New images are published nearly every week, but hidden in Hubble's huge data archives are some truly breathtaking images that have never been seen. They're called Hubble's Hidden Treasures, and between now and May 31, 2012, the European Space Agency (ESA), NASA's partner in the Hubble mission, invites you to help bring them to light. Just explore the Hubble Legacy Archive (HLA), dig out a great dataset, adjust the contrast and colors using the simple online tools, and submit to the Hubble's Hidden Treasures Contest Flickr group.

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