"The first artificial satellite, Sputnik $1$, was launched by the Soviet Union into Earth orbit on October $4$, $1957$. This event surprised the world and started the 'Space Race' between the United States and the Soviet Union. Sputnik $1$ orbited Earth for about three months before falling back into the atmosphere."
Sputnik $1$ ne zaman fırlatıldı?
A) In $1969$.
B) On October $4$, $1957$.
C) For three months.
D) After the Space Race.
