This comparison image of the core of the galaxy M100 shows the dramatic improvement in Hubble Space Telescope's view of the universe.

This comparison image of the core of the galaxy M100 shows the dramatic improvement in Hubble Space Telescope's view of the universe. From 15 Years of Discovery . More information on the ESA Hubble 15th Anniversary page.

Credit: ESA/Hubble (M. Kornmesser & L. L. Christensen)