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
Astronaut's Guide To Life In Space NASA 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