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Konstantin Tsiolkovsky
published the rocket equation and calculated that you could reach the orbit of Earth via multistage rocket
Robert Goddard
Built and launched the first liquid fueled rocket, eventually he would launch a gyroscopically controlled rocket
Sputnik I
first man made satellite to be put into orbit
Yuri Gagarin
1st person to reach space
John Glenn
1st person to orbit the Earth going around it a total of 3 times
Valentina Tereshkova
1st and youngest person in space, she fell asleep during the mission making ground control believe she was dead
Neil Armstrong
1st person to step foot onto the moon, and either he or Buzz Aldrin broke the switch to turn the landers engines back on to leave the moon