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the sputnik 1 was launched
part of the soviet space program
https://www.nasa.gov/multimedia/imagegallery/image_feature_924.html -
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gemini spacewalk
Gemini's objective was the development of space travel techniques to support the Apollo mission to land astronauts on the Moon.
https://www.britannica.com/science/Gemini-spacecraft-and-space-program -
apollo 1 disaster
It was the first crewed mission of the United States Apollo program, the undertaking to land the first man on the Moon. All 3 men died.
https://www.nasa.gov/mission_pages/apollo/missions/apollo1.html -
apollo 11 landing
Apollo 11 was the spaceflight that first landed humans on the Moon.
https://www.nasa.gov/mission_pages/apollo/missions/apollo11.html