|   The Pioneer Venus Orbiter atop an Atlas-Centaur before launch | |
| Orbital launches | |
|---|---|
| First | 6 January | 
| Last | 28 December | 
| Total | 128 | 
| Catalogued | 124 | 
| National firsts | |
| Space traveller |  Czechoslovakia  Poland  East Germany | 
| Rockets | |
| Retirements | Atlas-Agena Mu-3H | 
| Manned flights | |
| Orbital | 5 | 
| Total travellers | 10 | 
1978 saw the launch of the Pioneer Venus missions launched by the United States, on 20 May and 8 August. The Pioneer Venus Multiprobe landed four spacecraft on the planet, one of which transmitted data for 67 minutes before being destroyed by atmospheric pressure. ISEE-C, which was launched on 8 December, flew past comet 1P/Halley in 1985.