EXPLORER 3
| Launched | 25 March 1958 |
| Flight ended | 27 June 1958 |
| Status | Decayed |
| Launch site | Air Force Eastern Test Range, Florida, USA |
| Owner | United States |
| NORAD ID | 6 |
| COSPAR ID | 1958-003A |
| Observing |
EXPLORER 3
| Launched | 25 March 1958 |
| Flight ended | 27 June 1958 |
| Status | Decayed |
| Launch site | Air Force Eastern Test Range, Florida, USA |
| Owner | United States |
| NORAD ID | 6 |
| COSPAR ID | 1958-003A |
| Observing |