Forty years ago, in 1969, people walked on the Moon for the first time (Figure 1). This was only 12 years after the first artificial satellite, Sputnik, was launched in 1957 by the Soviet Union. You can find a brief summary of the Sputnik launch on this BBC website:
http://news.bbc.co.uk/onthisday/hi/dates/stories/october/4/newsid_2685000/2685115.stm
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