Answer:
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The correct sequence of the events is the following:
1. Sputnik I was the first artificial Earth satellite. The Soviet Union's Sputnik 1 satellite took to the skies on Oct. 4, 1957.
2. NASA was formed - The National Aeronautics and Space Administration (NASA) agency was was created in 1958 from NACA (National Advisory Committee for Aeronautics)
3. The Soviet pilot and cosmonaut Yuri Alekseyevich Gagarin completed an orbit of the Earth on 12 April 1961.
4. The astronaut John Glenn orbits the Earth on February 20, 1962.
Neil Armstrong lands on the moon,
