Soyuz Spacecraft

📷 Expedition 20 Crew, NASA / Wikimedia Commons (Public domain)

Soyuz is the longest-serving crewed spacecraft in history: a three-seat capsule designed in the Soviet Union in the 1960s that is still flying cosmonauts today. Since its first crewed launch in April 1967 it has made about 145 crewed flights — more than any other spacecraft — and after the Space Shuttle retired in 2011, it spent nine years as humanity’s only ride to the International Space Station.

The ship is small — 7.5 m long and about 7 tonnes — but ruthlessly practical. Its basic three-module layout has barely changed in six decades, even as everything inside was modernized. When engineers describe a design as a workhorse, Soyuz is what they mean.

Development History

Sergei Korolev’s design bureau conceived Soyuz in the early 1960s as part of the Soviet Moon program, where versions of it were meant to carry cosmonauts on lunar flights. The Moon effort died, but the ferry survived. The first uncrewed test flew in November 1966, and Soyuz 1 followed in April 1967 — ending in disaster when the parachute failed and Vladimir Komarov became spaceflight’s first in-flight fatality.

A second tragedy struck in June 1971, when the Soyuz 11 crew — the first to occupy a space station, Salyut 1 — died during reentry after a valve vented their cabin to vacuum. Cosmonauts have worn pressure suits for launch and landing ever since. No Soyuz crew has been lost since 1971.

The spacecraft then evolved through major generations — Soyuz T in the 1980s, TM from 1986, TMA from 2002, and today’s digital Soyuz MS from 2016 — serving the Salyut stations, Mir, and now the ISS. Its cargo-carrying cousin, Progress, still supplies the station.

Design & Capabilities

Soyuz is built from three stacked modules. Up front is a roughly spherical orbital module used as living space; in the middle sits the bell-shaped descent module where the crew rides through launch and landing; behind is the service module with solar panels, tanks, and the KTDU-80 main engine burning storable propellants. Only the descent module comes home — the other two burn up.

The spacecraft launches on a Soyuz rocket, usually from Baikonur in Kazakhstan, and orbits at about 28,000 km/h. Since the late 2010s, fast-rendezvous profiles have cut the trip to the ISS to as little as about three hours. At mission’s end the descent module parachutes onto the Kazakh steppe, firing soft-landing rockets a moment before touchdown to cushion the thump.

Its launch escape system is proven, not theoretical: it pulled crews clear of a burning rocket on the pad in 1983 and away from a failing booster in mid-air on Soyuz MS-10 in 2018. Both crews walked away.

Notable Missions

In January 1969, Soyuz 4 and 5 performed the first docking of two crewed spacecraft, with cosmonauts spacewalking from one ship to the other. In July 1975, Soyuz 19 docked with an Apollo spacecraft in the Apollo-Soyuz Test Project — the first international docking, and the symbolic end of the space race.

In October 2000, Soyuz TM-31 delivered Expedition 1 to the brand-new ISS, beginning a run of continuous station service that has never stopped. Between the Shuttle’s last flight in 2011 and Crew Dragon’s first crewed mission in 2020, every single human who reached orbit flew on a Soyuz — a quiet monopoly unmatched in spaceflight history.

Frequently Asked Questions

Why has Soyuz lasted so long?

Because the basic design solved the problem well and cheaply. The three-module layout keeps the reentry capsule small and light, the systems are simple enough to upgrade piece by piece, and decades of flights have wrung out the failure modes. Russia has repeatedly chosen to refine Soyuz rather than fund a risky replacement, so the same silhouette keeps flying.

How many people does a Soyuz carry?

Three, seated knees-up in custom-molded couches inside a descent module about 2.2 m across. It is a famously snug ride — taller astronauts must fit within strict height limits — and each crew member can bring only a small amount of personal cargo. The cramped capsule is one reason station crews unload into roomier quarters as soon as they dock.

Is Soyuz safe?

Its record since 1971 is remarkable. The program’s two fatal accidents, in 1967 and 1971, both led to fixes that have held for over fifty years. The launch escape system has saved crews twice, in 1983 and 2018. With about 145 crewed flights, Soyuz has carried more crews than any other spacecraft, making its long-run safety record the benchmark others are measured against.

How long does a Soyuz take to reach the ISS?

Originally about two days of phasing orbits. Modern navigation changed that: since 2018-2020, ultra-fast profiles let a Soyuz dock after just two orbits — roughly three hours from the launch pad in Kazakhstan to the station. That is quicker than many airline trips between continents, and it spares the crew a long wait in a cramped cabin.