| SATELLITE | COUNTRY | LAUNCH DATE |
| Sputnik 1 | USSR | 04 Oct 1957 |
| Sputnik 2 | USSR | 03 Nov 1957 |
| Explorer 1 | USA | 01 Feb 1958 |
| Vanguard | USA | 17 Mar 1958 |
| Explorer 3 | USA | 26 Mar 1958 |
| Sputnik 3 | USSR | 15 May 1958 |
| Explorer 4 | USA | 26 July 1958 |
| SCORE | USA | 18 Dec 1958 |
| Vanguard 2 | USA | 17 Feb 1959 |
| Discoverer 1 | USA | 28 Feb 1959 |
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