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The Sputnik 1 launching started the space race. It was humanity's first artificial satellite.
https://www.nasa.gov/multimedia/imagegallery/image_feature_924.html -
First US satellite to launch. It could measure the radiation environment.
https://www.nasa.gov/mission_pages/explorer/explorer-overview.html -
The Luna 1 was the first spacecraft to reach the moon. It was launched by the Soviets. It was made to measure the temperature and pressure of space.
https://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id=1959-012A -
Ham the chimp was the first monkey in space. He preformed his lever pulling tasks and survived the flight.
https://www.nasa.gov/image-feature/chimpanzee-ham-with-trainers -
Yuri Gagarin was the first human to orbit earth. He was part of the Soviet air force and only manned one mission.
https://starchild.gsfc.nasa.gov/docs/StarChild/whos_who_level2/gagarin.html -
Alan Shepherd was the first american in space and he later walked on the moon. He was on the Mercury 7 and did not orbit earth.
https://www.nasa.gov/audience/forstudents/k-4/stories/nasa-knows/who-was-alan-shepard-k4.html -
John Glen's flight on the Freedom 7 was risky. the automatic controls failed but he survived to tell the tale.
https://www.nasa.gov/content/profile-of-john-glenn -
It was a early NASA program that proved astronauts could fly in space. There were many missions and it ended in 1966.
https://www.nasa.gov/audience/forstudents/5-8/features/nasa-knows/what-was-gemini-program-58.html -
The Apollo 1 during a rehearsal attempt caught fire killing it's crew. It made many realize how dangerous the missions actually were.
https://www.space.com/17338-apollo-1.html -
It demonstrate trans lunar injection; CSM navigation, communications and mid-course corrections.
https://www.nasa.gov/mission_pages/apollo/missions/apollo8.html -
The Apollo 11 landed on the moon and returned ending the space race. The US won the race and Neil Armstrong's walk on the moon was televised.
https://www.nasa.gov/mission_pages/apollo/missions/apollo11.html