NASA’s best-recognized, longest-lived, and most prolific space observatory was launched April 24, 1990, aboard the space shuttle Discovery. Hubble discoveries revolutionized nearly all areas of current astronomical research from planetary science to cosmology. To celebrate this historic event, NASA and the Space Telescope Science Institute, or STScI, in Baltimore are celebrating Hubble’s journey of exploration with a stunning new picture and several online educational activities. There are also opportunities for people to explore galaxies as armchair scientists and send personal greetings to Hubble for posterity.