Launch of Sputnik

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1.
Sputnik
2.
satellite
3.
space
4.
orbit
5.
technology
6.
innovation
7.
exploration
8.
science
9.
milestone
10.
discovery
11.
mission
12.
achievement
13.
signals
14.
research
15.
experiment
16.
pioneer
17.
breakthrough
18.
communication
19.
launch
20.
history