1. 1954
   1. 10.4-Sputnik
   2. a Russian beach-ball size space probe
2. 1957
   1. 11.3-Sputnik 2
   2. the Soviets launched a more massive satellite, which carries a dog, Laika
3. 1958
   1. 1.31-Explorer 1
   2. the United States' first satellite
4. 1961
   1. April - Yuri Gagarin from the Soviet Union was the first human in space.
   2. On May 5, NASA astronaut Alan Shepard Jr. became the first American in space.
5. 1971
   1. the Soviet Union constructed the world's first space station, Salyut 1
6. TBC...