The school-bus-sized observatory launched on April 24, 1990 and overcame early setbacks to become one of the most scientifically productive instruments in history. From its vantage point 320 miles (515 kilometers) above Earth, the telescope has sent home more than 1.6 million observations contributing to over 21,000 scientific papers.

The anniversary celebration also included a countdown of images captured over the Hubble Space Telescope's lifetime so far, one for each year in orbit.