Hubble: 15 Years of Discovery forms a key element of the European Space Agency's 15th anniversary celebration activities for the 1990 launch of the NASA/ESA Hubble Space Telescope.

As an observatory in space, Hubble is one of the most successful scientific projects of all time, both in terms of scientific output and its immediate public appeal.

Hubble continues to have an enormous impact by exploiting a unique scientific niche where no other instruments can compete. It consistently delivers super-sharp images and clean, uncontaminated spectra over the entire near-infrared and ultraviolet regions of the electromagnetic spectrum. This has opened up new scientific territory and resulted in many paradigm-breaking discoveries.