In which year was Sputnik 1 launched?

The correct answer is 1957. Sputnik 1, the first artificial Earth satellite, was successfully launched by the Soviet Union on October 4, 1957. This monumental event marked the beginning of the Space Race between the USSR and the USA, profoundly influencing scientific and technological advancements globally.

• 1947 was too early, shortly after World War II, before the major push into space exploration.
• 1953 was also before the critical developments that led to the Sputnik launch.
• 1963 was after Sputnik, a period characterized by more advanced space missions and the escalation of the Space Race.