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Telescope
the telescope was invented -
Jupiters moons
Galileo discovered Jupiters four largest moons -
Rocket launch
first liquid fueled rocket launched by the US scientist, Robert H. Goddard -
Altitude
US reaches it's first high altitude space flight at 50 miles high -
Sputnik 1
first satellite
first signals from space -
Animals
Laika, launched by USSR, first animal launched into orbit -
Moon
first pictures of far side of moon -
Mars
first Mars fly by -
Mars
First photos and soil samples from the surface of Mars -
Saturn
first Saturn fly by -
Solar System
first picture of the whole solar system -
Gas Giant
First mission into the atmosphere of a gas giant -
Titan
First soft landing on Titan -
Comet
first man made probe to land on a comet