Launched the uncrewed Progress M-55 cargo spacecraft to resupply the International Space Station.
- Outcome
- Success
- Payload to orbit
- 9.8 T
- Flight
- 667th
- of 714 Soyuz U flights
- Date and time
- 21 December 2005, 18:38 UTC
- Rocket
- Soyuz U
- Builder
- Progress RSC
- Launch site
- 1/5, Baikonur Cosmodrome, Republic of Kazakhstan
- Payload
- Unknown
- International designator
- 2005-047
- Launches in 2005
- 51st of 56
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