An all-star gathering of legendary American astronauts appeared in Cleveland Aug. 29, 2008 to celebrate NASA's 50th anniversary. John Glenn, the first American to orbit Earth, Neil Armstrong, the first person to walk on the moon, Jim Lovell, veteran of two Apollo missions, and Kathryn Sullivan, the first woman to walk in space joined 15 other astronauts from Ohio.
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(image credit: NASA)
NASA also has an interactive timeline about their 50 years in the space exploration business. Link