Sputnik-1, the first artificial Earth satellite. It was launched on October 4th, 1957 by Soviets. Science and technologies were very important for the Soviet Union back then.
‘Sputnik’ is one of a few words Russian languages coined into the global vocabulary. Did you know that it should be pronounced as spoot-nik, like ‘put’? There is a little hint – an IPA pronunciation of ‘sputnik’ (take a look at the number 1 in Sputnik-1 sign), so you won’t forget it and can teach others!