Atop a Proton rocket from the Baikonur Cosmodrome, a 42,600-pound module named Zarya, or "Sunrise," slipped Earth's gravity. It carried no crew. Its mission was to become a cornerstone. This pressurized canister, funded by NASA but built by the Russian space agency, was the first physical piece of the International Space Station. For two weeks, it orbited alone, a solitary shed awaiting the arrival of its first wall. The American module Unity docked with it on December 6, 1998, and the orbital construction site was officially open.
Zarya’s launch mattered not for its own capabilities, but for its promise of connection. It provided the station’s initial propulsion, power, and storage. More critically, it served as the functional and political keystone between Russian and American space hardware. The module’s design was a hybrid, with Russian exterior docking ports and American interior fittings. This technical compromise mirrored the geopolitical one that made the station possible in the post-Cold War 1990s.
The common misunderstanding is that the ISS was a finished project sent up whole. It was instead an exercise in incremental, remote-controlled architecture. Zarya was a foundation poured in a vacuum. Over the next decade, more than 30 additional flights by American shuttles and Russian rockets would deliver the station’s other modules, trusses, and solar arrays, with astronauts conducting complex spacewalks to bolt them together.
The lasting impact is a permanent human foothold off the planet. Every continuous day of human presence in space since November 2, 2000, traces its lineage to that single, uncrewed launch. Zarya, now over a quarter-century old and long superseded by newer modules, remains an integral part of the orbiting complex. It is the original room in a house that now spans the length of a football field.