Answer:
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
