| Term | Definition |
|---|---|
| 1920-1929 | Robert H. Goddard experimented wit liquid fuels, and showed that liquid could provide continuous power. |
| 1950-1959 & 1960-1969 | (50's&60's) The development of multistage rockets made it possible to send rockets to the moon and farther into space. |
| 1950-1959 | Soviet Union launched the 1st artificial satellite in orbit around Earth. |
| 1950-1959 | Thousands of artificial satellites have been in orbit |
| 1950-1959 | USA launched Explorer 1 into orbit. |
| 1960-1969 | Yuri Gagarin, a Soviet cosmonaut orbited Earth becoming the 1st person in space. |
| 1960-1969 | The USA and Soviet Union sent dozens of rockets to explore the moon. |
| 1970-1979 | Developed 1st reusable space shuttles. |
| 1970-1979 | Soviet Union launched Salyut |
| 1970-1979 | USA launched Skylab |
| 1970-1979 | NASA developed the reusable space shuttle (National Aeronautics and Space Administration) |
| 1970-1979 | The USA and Soviet Union sent rockets to the moon to explore |
| 1980-1989 | Launched the 1st space station |
| 1980-1989 | Launched Mir space stations |
