Zvezda Service Module

The Zvezda service module played a major role in making the International Space Station habitable by providing early living quarters, life-support systems, power distribution, data systems, and propulsion support. It became a cornerstone of the station’s early operations and helped make long-duration human presence in orbit possible. Zvezda represents a critical stage in the station’s development by showing how essential support systems and crew accommodations were built into the growing structure from the beginning.