SpaceX rocket Falcon 9 at Cape Canaveral in Florida was scheduled to launch Saturday morning, but aborted just before liftoff. Roberto Gonzalez/Getty Images hide caption
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More than a million people were expected in the area around the Kennedy Space Center to watch the launch. Many arrived before sunrise to claim the best seats. Scott Cameron/NPR hide caption
Michael Soluri's black and white film photographs of NASA's human space flight programs over the years, spanning Apollo and the Space Shuttle Copyright Michael Soluri - All Rights Reserved hide caption
Space Shuttle Atlantis lands at Kennedy Space Center July 21, 2011 in Cape Canaveral, Florida. Joe Raedle/Getty Images hide caption
Food packets containing the astronauts' "all-American meal," including (clockwise from top left) corn, chicken, brisket, and beans, along with a lemonade, at right. Devin Boldt/NASA - JSC hide caption
The space shuttle Atlantis lifts off from the Kennedy Space Center Friday, July 8, 2011, in Cape Canaveral, Fla. Morry Gash/AP hide caption
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Onlookers crowd around their cars in the NASA causeway as they watch the US Space Shuttle Atlantis blast off into orbit from launch pad 39-B at Kennedy Space Center in the early morning hours of July 12 2001. Brian Cleary/AFP/Getty Images hide caption
Astronaut Steve Bowen works outside the International Space Station's Quest airlock during Monday's spacewalk. Bowen's spacewalk was unexpectedly extended by a computer malfunction. NASA TV hide caption