TITUSVILLE, FL - MAY 15: A message is seen on a sign ahead of space shuttle Endeavour's final launch on May 15, 2011 in Titusville, Florida. Hundreds of thousands of spectators are expected to come ... more 
TITUSVILLE, FL - MAY 15: A message is seen on a sign ahead of space shuttle Endeavour's final launch on May 15, 2011 in Titusville, Florida. Hundreds of thousands of spectators are expected to come out to watch space shuttle Endeavour embark on its final flight to the International Space Station on May 16. (Photo by Justin Sullivan/Getty Images) less 
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Getty Images | Photo By Justin Sullivan / Getty Images
Sun, May 15, 2011 9:14 PM EDT