October 4, 1957 - Sputnik I was launched into space
Sputnik I, launched on October 4, 1957 by the Soviet Union, was the first artificial satellite in history.
January 31, 1958 - Explorer I was launched
Explorer I was the first artificial satellite placed in Earth orbit by the United States. It was launched on January 31, 1958 in response to the launching of Sputnik I and Sputnik II by the Soviet Union, thus giving way to the space race, closely related to the Cold War.
April 12, 1961 - Humans orbited Earth
On April 12, 1961, aboard the ship Vostok I, the Soviet Yuri Gagarin was launched into outer space being the first human being to reach it and travel through it.
July 20, 1969 - The first human stepped onto the Moon
In July of 1969, as part of the Apollo 11 mission, Neil Armstrong and Buzz Aldrin descended to the surface of the Moon and walked through it for two and a half hours.
Answer:
Sputnik I was launged into space
Explorer I was launched
Humans orbited Earth
The first human stepped onto the moon
Explanation:
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