23 Launch of Sputnik (1950s)

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1.
Sputnik
2.
experiment
3.
launch
4.
Satellite
5.
USSR
6.
Cosmos
7.
Telemetry
8.
Rocket
9.
Korolev
10.
Radiosignals
11.
Vostok
12.
Globalimpact
13.
Baikonur
14.
Atmosphere
15.
Ionization