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First artificial earth satellite: Sputnik.  

First animals to successfully orbit the earth: Belka and Strelka.  

First on the moon: Luna 2 probe.

First man in space: Yuri Gagarin.  

First woman in space: Valentina Tereshkova.  

First spacewalk: Alexei Leonov.  

First remote-controlled rover on another celestial body: Lunokhod 1

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