|Function||Medium launch vehicle|
|Country of origin||Soviet Union|
|Launch sites||Baikonur, Plesetsk|
The 8K78 resulted from a crash program by the Korolev Bureau to develop a booster for launching planetary probes. A larger third stage was added along with a fourth stage (Blok L) that was designed to fire in-orbit to send the payload out of LEO. The basic R-7 core was also structurally strengthened and given more powerful engines. A rushed development produced multiple malfunctions of the upper stages, which led to its being replaced by the improved Molniya-M in 1964, but there were enough 8K78s left to continue flying them into 1967. The Molniya also carried early Venera probes to Venus.
Molniya (E6) was a minor revision adapted for launch of some Luna series space probes.
- Length: 43.440 m
- Diameter: 10.300 m
- Launch mass: 305,000 kg
- Harvey, Brian (5 July 2007). Russian Planetary Exploration: History, Development, Legacy and Prospects. p. 73. ISBN 978-0-387-46343-8.
- Encyclopedia Astronautica Molniya-1 Archived 16 May 2008 at the Wayback Machine
- Encyclopedia Astronautica Molniya 8K78M Archived 8 May 2012 at the Wayback Machine
- Encyclopedia Astronautica Molniya-2 Archived 2 June 2012 at the Wayback Machine
- The Soyuz Launch Vehicle: The Two Lives of an Engineering Triumph By Christian Lardier, Stefan Barensky, page 156
"Molniya-M Carrier Rocket". РКЦ Прогресс. Retrieved 7 October 2014.