ISS Retirement: What Happens When the Space Station Comes Down?
The International Space Station — humanity's most complex engineering project and our continuous home in space since November 2000 — is scheduled for retirement in 2030. The transition to commercial successors is already underway, and the choices made in the next four years will shape human spaceflight for generations.
The International Space Station has been continuously inhabited since November 2, 2000 — a quarter century of unbroken human presence in orbit. It has hosted over 270 visitors from 20 countries, conducted more than 3,000 scientific experiments, and cost approximately $150 billion to build and operate across its lifetime. But the station was not designed to last forever, and the structural challenges accumulating in its aging modules — combined with mounting operational costs — have set 2030 as the planned end date. Understanding how the ISS comes down, and what comes next, matters for every person who cares about humanity's future in space.
Why the ISS Is Retiring
The ISS is not retiring because NASA wants to stop doing space station operations — it is retiring because the station is aging out of its safe operational life. The oldest modules, Zarya (1998) and Unity (1998), are now more than 27 years old. The Russian Zvezda service module, launched in 2000, has been exhibiting small cracks in its hull that have been monitored since 2019 and addressed through sealants and patches, but represent the kind of structural fatigue that accumulates in a vehicle experiencing 16 orbital sunrises and temperature swings from +120°C to -120°C every single day.
A comprehensive structural analysis conducted by NASA in the early 2020s projected that the station can be safely operated through 2030 but that extending operations significantly beyond that date would require expensive structural repairs that may not be feasible while the station is in orbit. NASA also pointed to the economics: the ISS currently costs approximately $3–4 billion per year to operate — nearly a fifth of NASA's total annual budget — devoted to a single facility in low Earth orbit. That funding could instead be used to anchor a commercial successor while freeing resources for deep-space exploration.
How the ISS Will Be Deorbited
The ISS cannot simply be abandoned — an uncontrolled reentry of a 420-tonne facility would be one of the largest uncontrolled reentries in history, with debris potentially falling anywhere along a swath covering most of Earth's populated regions. NASA's deorbit plan, developed with international partners, calls for a controlled reentry using a dedicated deorbit vehicle. NASA selected SpaceX to develop the US Deorbit Vehicle (USDV), a derivative of the Dragon spacecraft with enhanced propulsion capability, under a contract awarded in 2024. The USDV will dock with the station and use a series of carefully calculated deorbit burns over multiple orbits to precisely target the entry corridor.
The intended impact zone is a remote stretch of the South Pacific Ocean known informally as the "spacecraft cemetery" or Point Nemo — the oceanic point of inaccessibility located approximately 2,700 kilometers from the nearest land, equidistant from three uninhabited islands. This region has been used for decades as the disposal site for decommissioned spacecraft: Russia's Mir station, numerous Progress cargo vehicles, ESA's ATV resupply ships, and several other spacecraft rest on the ocean floor here. The ISS will follow the same path.
Not all of the station will burn up. During reentry, the most refractory components — titanium pressure vessels, stainless steel tanks, heavy structural elements — are expected to survive the thermal environment and reach the ocean. The reentry will be planned for a trajectory ensuring these surviving fragments fall within a narrow corridor over open ocean. NASA has consulted with maritime authorities to issue navigational warnings during the reentry window.
The ISS Legacy: 25 Years of Continuous Occupation
The ISS has been inhabited continuously since Expedition 1's arrival on November 2, 2000 — a streak of human presence in orbit that will stand as one of the great sustained achievements of the Space Age. More than 270 people from 20 nations have lived and worked aboard the station, with crews typically rotating on 6-month schedules. The record for the longest single spaceflight currently stands at 371 days, set by astronaut Frank Rubio aboard the ISS in 2022–2023.
The scientific return has been substantial. More than 3,000 experiments across disciplines ranging from fundamental biology, materials science, and fluid physics to Earth observation, astronomy, and medical research have been conducted aboard the station. The microgravity environment has enabled research impossible on Earth: long-duration protein crystal growth, combustion studies in the absence of convection, observations of flame behavior that have informed more efficient combustion engineering, cardiovascular and musculoskeletal studies that have reshaped our understanding of how the human body adapts to weightlessness, and plant growth experiments directly relevant to long-duration crewed missions. The ISS has also served as a technology testbed, validating life support systems, spacesuits, robotic systems, and crew interfaces that inform every future crewed spacecraft design.
Commercial Successors: The New Station Race
NASA's strategy for the post-ISS era is to be a customer rather than an owner. Rather than designing, building, and operating its own replacement station, NASA's Commercial Low Earth Orbit Destinations (CLDD) program — formerly called the Commercial LEO Destinations Framework, or CDFF — awarded $415 million in development contracts in 2021 and 2023 to multiple companies developing commercial stations. NASA will purchase crew time and research services aboard these stations, just as it purchases launch services from SpaceX and ULA. The target is to have at least one commercial station operational before the ISS is deorbited, ensuring continuous US presence in LEO.
Axiom Station
Axiom Space has the most advanced near-term plan. The company is attaching proprietary research and habitation modules to the ISS's forward port, beginning with Axiom Module 1 (expected to dock in 2026). These modules will operate as part of the ISS while the station is active, then detach and form the nucleus of an independent Axiom Station after ISS retirement. This approach gives Axiom's station an operational head start, because its early modules will have already hosted paying customers and proven their systems while physically connected to the ISS. Axiom has already demonstrated its commercial model through four Axiom-branded private astronaut missions to the ISS, including Ax-4, which carried ISRO's Shubhanshu Shukla.
Starlab
Starlab, a joint venture between Voyager Space and Airbus, is developing a single-module space station targeting launch no earlier than 2028. Unlike modular stations assembled over time, Starlab is designed as a large single launch — a roughly 340 cubic meter pressurized volume that would be larger than the US segment of the ISS, accommodating four crew members and a full complement of research facilities. Nanoracks (now part of Voyager) and Airbus are contributing complementary expertise in commercial space systems and large pressurized structures respectively. Starlab received a NASA CDFF award and has signed memoranda of understanding with multiple international space agencies interested in purchasing research time.
Orbital Reef
Orbital Reef, a collaboration between Blue Origin and Sierra Space (with MDA Space and other partners), envisions a mixed-use business park in orbit — a commercial destination hosting research, manufacturing, tourism, and other activities. Blue Origin's New Glenn rocket would serve as the primary launch vehicle. Sierra Space is developing the LIFE (Large Integrated Flexible Environment) inflatable habitat module, a large expandable structure that could provide substantial volume per launch mass. Orbital Reef received NASA CDFF funding in 2021 but has faced timeline pressures as Blue Origin ramped up New Glenn operations. Its target operational date has shifted into the late 2020s to early 2030s.
Haven-1 (Vast Space)
Startup Vast Space, backed by cryptocurrency entrepreneur Jed McCaleb, developed the Haven-1 module on an aggressive timeline, targeting launch aboard a SpaceX Falcon 9 as early as August 2026. If successful, Haven-1 would become the world's first commercial space station — preceding the other competitors by several years. Haven-1 is a relatively compact module that would host up to four crew members on short-duration missions, with SpaceX's Dragon providing crew transport. Vast has signed a commercial agreement with SpaceX for a crewed mission to Haven-1 following a period of uncrewed checkout.
International Partners: What Happens to Russia, ESA, JAXA, and CSA?
The ISS is a joint program among NASA (United States), Roscosmos (Russia), ESA (European Space Agency), JAXA (Japan), and CSA (Canada). Russia has consistently stated its intention to develop its own national space station, the ROSS (Russian Orbital Service Station), which would be positioned at a higher inclination orbit offering better coverage of Russian territory. The first ROSS module is planned for the late 2020s, though Russia's space budget and industrial capacity have been significantly constrained since 2022. Russia's participation in the ISS program through 2030 has been confirmed diplomatically, but the cooperation level in post-ISS activities remains uncertain.
ESA and JAXA are both engaged with NASA on the potential for their national space agencies and researchers to purchase services aboard commercial successors. ESA has expressed interest in contributing hardware to commercial stations in exchange for crew time — a model similar to ESA's contributions to the ISS (Columbus laboratory, ATV resupply) in exchange for crew slots. JAXA similarly leverages its ISS contributions (HTV cargo vehicle, JEM Kibo laboratory) for crew access and could seek analogous arrangements with commercial station operators. The transition period of 2026–2030 will be critical for negotiating these frameworks.
The Economics: Can Commercial Stations Do It Cheaper?
The ISS costs approximately $3–4 billion per year to operate, with NASA's share roughly $1.5–2 billion annually and international partners contributing the remainder through their own operations. Commercial station operators have publicly targeted dramatically lower price points. Axiom Space CEO Michael Suffredini has indicated a target of roughly $1 billion per year for full operations — less than half the ISS operational cost — enabled by commercial revenue from private customers, government research contracts, and potentially space tourism and manufacturing. Starlab and Orbital Reef have cited similar cost targets. Whether these projections are achievable in practice will depend on occupancy levels, the breadth of the commercial market for microgravity services, and operational efficiency in the absence of the ISS's legacy infrastructure.
The transition also creates a gap risk: if no commercial station is fully operational by 2030, the United States faces a period without any human presence in low Earth orbit for the first time since 2000. NASA's CLDD program was explicitly designed to avoid this by providing development funding to multiple independent companies, reducing the single-point-of-failure risk. The redundancy of competing programs, rather than a single NASA-owned replacement, is the deliberate strategy for ensuring continuity — accepting some overlap and redundant investment as insurance against any individual program slipping.