Chang Zheng-4

The Long March 4 (Chang Zheng-4, or CZ-4) is a family of three-stage, liquid-propellant orbital launch vehicles introduced in the 1980s for Sun-Synchronous Orbit (SSO) launch missions. It was based on the two-stage CZ-2, but added with a hypergolic third-stage in order to reach higher orbit. The early variant CZ-4A has retired and been succeeded by the improved B and C variants.

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