Deep Space Rendezvous
| Date (GMT) | Spacecraft | Event | Remarks |
|---|---|---|---|
| 15 January | Luna 21 | Delivered Lunokhod 2 between Mare Serenitatis and the Taurus Mountains | |
| 15 June | Explorer 49 | Entered Selenocentric orbit | Radio telescope |
| 3 December | Pioneer 10 | Flyby of Jupiter | Closest approach: 130,354 kilometres (80,998 mi) |
Read more about this topic: 1973 In Spaceflight
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