Space+Exploration

Key milestones in space exploration
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Exploration
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National Archives Space Exploration Timeline
http://www.archives.gov/research/alic/reference/space-timeline.html

Key Events in the History of Space Exploration
http://www.telegraph.co.uk/science/picture-galleries/8186992/Key-events-in-the-history-of-space-exploration.html?image=1

Space Kids: Learn About Space
http://www.spacekids.co.uk/spacehistory/

NASA History, 1958-1998
http://history.nasa.gov/40thann/define.htm

Smithsonian http://blog.nasm.si.edu/2010/12/30/ten-events-of-great-significance-in-space-exploration-during-the-twenty-first-century%E2%80%99s-first-decade/

NASA's 10 Greatest Achievments http://science.howstuffworks.com/ten-nasa-achievements.htm#page=0