Dr. John Grunsfeld, associate administrator, Science Mission Directorate, NASA, speaks at an event to commemorate the 25th anniversary of the Hubble Space Telescope, Tuesday, April 21, 2015 at the Capitol Hill Visitor Center in Washington, DC. National Geographic's documentary "Hubble's Cosmic Journey" was shown at the event that was attended by Congressional members, NASA staff, and National Geographic staff. NASA's Hubble Space Telescope was launched April 24, 1990, onboard the space shuttle Discovery from Kennedy Space Center in Florida and has made more than million observati

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