 | This timeline of spaceflight may require cleanup to ensure consistency with other timeline of spaceflight articles. See Wikipedia:WikiProject Spaceflight/Timeline of spaceflight working group for guidelines on how to improve the article. Details Concerns have been raised that:
|  |
 Launch of Voyager 2 on a Titan IIIE | |
| Orbital launches | |
|---|---|
| First | 6 January |
| Last | 27 December |
| Total | 130 |
| Catalogued | 124 |
| Rockets | |
| Maiden flights | Mu-3H Tsyklon-3 |
| Retirements | Kosmos-2I Titan IIIE |
| Crewed flights | |
| Orbital | 3 |
| Total travellers | 6 |
Spaceflight in 1977 included some important events such as the roll out of the Space Shuttle orbiter, Voyager 1 and Voyager space probes were launched. NASA received the Space Shuttle orbiter later named Enterprise, on 14 January. This unpowered sub-orbital space plane was launched off the top of a modified 747 and was flown uncrewed until 13 August until a human crew landed the Enterprise for the first time.
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In August and September, the two Voyager spacecraft to the outer planets were launched. Voyager 2 , launched on 20 August, went on to fly past Jupiter, Saturn, Uranus and Neptune. Voyager 1 , which was launched on 5 September, flew past Jupiter and Saturn, with a planned flyby of Pluto being cancelled in favour of a closer flyby of Titan. [1]
