The End of the ISS: Deorbit Plan 2030

For over two decades, the International Space Station (ISS) has served as humanity’s primary outpost in orbit. However, aging hardware and structural fatigue mean this era is drawing to a close. NASA has officially finalized the strategy to bring the massive structure down safely. Instead of letting it fall uncontrolled, the agency has commissioned a specialized “space tug” to guide the station into a remote section of the ocean.

The Need for a Controlled Crash

The International Space Station is the largest object humans have ever built in space. It spans the area of a football field and weighs nearly 1 million pounds. Because of its sheer size and density, it cannot burn up completely upon re-entry into Earth’s atmosphere. NASA estimates that dense components, such as the titanium trusses and heavy docking ports, will survive the intense heat of re-entry.

If the ISS were allowed to decay naturally, its fall would be uncontrolled. This creates a significant risk to populations on the ground, as debris could scatter over a massive area. To mitigate this risk, NASA determined that a controlled deorbit is the only viable option. This requires a high-powered vehicle to push the station out of orbit at a precise time and angle to ensure it lands in the ocean.

Why Not Push It Higher?

A common question is why NASA does not simply boost the ISS into a higher “graveyard orbit” like they do with some satellites. The answer comes down to physics and cost. Pushing the 400-tonne station to a safe altitude above low-Earth orbit would require an impossible amount of fuel. Furthermore, higher orbits are fraught with intense radiation belts that would degrade the station quickly, turning it into a massive, uncontrollable piece of space junk that could threaten future launches for centuries.

SpaceX and the US Deorbit Vehicle (USDV)

In June 2024, NASA announced it had selected SpaceX to build the spacecraft responsible for the station’s final journey. The contract has a potential value of $843 million. The spacecraft is officially designated as the United States Deorbit Vehicle (USDV).

While SpaceX plans to base the design on its existing Dragon cargo spacecraft, the USDV will be a significantly modified beast. Standard cargo runs to the ISS require finesse, but this mission requires brute force.

Key Technical Specifications of the USDV:

• Enhanced Trunk Section: Unlike the standard Dragon, which has a smaller service module, the USDV will feature an enlarged trunk section to house massive propellant tanks.
• Thrust Power: The vehicle will be equipped with 46 Draco thrusters. For comparison, a standard Dragon spacecraft utilizes roughly 16 thrusters for orbital maneuvering. This extra power is necessary to fight the atmospheric drag and keep the massive station steady during the descent.
• Fuel Capacity: It will carry over 35,000 pounds of propellant. This is roughly six times the fuel load of a standard Dragon mission.
• Power Generation: The vehicle needs to generate roughly three to four times the power of a standard spacecraft to support the avionics and thermal controls during the high-stress final burn.

The Timeline: How the End Will Happen

NASA and its international partners (ESA, JAXA, and CSA) have committed to operating the station through 2030. Russia’s Roscosmos has committed through at least 2028. The actual re-entry process will likely occur in early 2031.

The deorbit procedure is a multi-year process involving several distinct phases:

1. The Natural Decay (2026–2030)

Currently, visiting spacecraft periodically boost the ISS to keep it at an altitude of roughly 250 miles (400 km). Starting a few years before the end date, mission control will stop these reboost maneuvers. Atmospheric drag will slowly pull the station closer to Earth. This saves fuel for the final push.

2. The Launch of the USDV (Late 2030)

Once the station drops to an altitude of roughly 200 miles, SpaceX will launch the USDV aboard a heavy-lift rocket. It will dock with the ISS and undergo a series of systems checks. The crew will eventually depart, leaving the station unmanned for the first time since 2000.

3. The Final Descent (Early 2031)

When the station reaches an altitude of roughly 136 miles (220 km), the USDV will begin a series of braking maneuvers. This is the “point of no return.” The dense atmosphere at this altitude exerts tremendous torque on the solar panels. The USDV’s 46 thrusters must fire aggressively to keep the station from tumbling.

4. Re-entry and Splashdown

The final burn will drive the perigee (the lowest point of the orbit) deep into the atmosphere. The station will break apart. The solar arrays will tear off first, followed by the cooling radiators and modules. The surviving debris will splash down roughly 30 to 60 minutes after the final burn begins.

Target: Point Nemo

Accuracy is paramount. NASA targets the South Pacific Ocean Uninhabited Area, commonly known as “Point Nemo.” This location is the “pole of inaccessibility,” meaning it is the geographic point on Earth that is farthest from any land.

Point Nemo is located approximately 1,670 miles away from the nearest landmass (Ducie Island to the north, Motu Nui to the northeast, and Maher Island to the south). It is essentially a spacecraft graveyard; hundreds of satellites and the former Russian space station, Mir, have been buried there.

Because the ISS is so large, the debris footprint will be substantial. Debris could spread across a narrow strip of ocean thousands of miles long. By targeting Point Nemo, NASA ensures the statistical risk of hitting a boat or aircraft is virtually zero.

The Future After ISS

The destruction of the ISS does not mean the end of human presence in low-Earth orbit. NASA is transitioning to a model where it buys services from private companies rather than owning the hardware itself. Several commercial space stations are currently in development to replace the ISS:

• Axiom Space: They plan to launch modules that will initially attach to the ISS before detaching to form a free-flying station.
• Orbital Reef: A joint project involving Blue Origin and Sierra Space, designed as a “mixed-use business park” in space.
• Starlab: A project by Voyager Space and Airbus, focused on scientific research.

NASA aims to have at least one of these commercial stations operational before the ISS hits the water in 2031 to prevent a gap in orbital capabilities.

Frequently Asked Questions

Will the ISS crash into land? No. The entire mission of the USDV is to ensure the station crashes into the remote Pacific Ocean. If the vehicle fails, the station would re-enter randomly, which carries a small but unacceptable risk to populated areas. The $843 million investment is an insurance policy against that scenario.

Why did NASA choose SpaceX over other contractors? Northrop Grumman was the other primary contender. However, SpaceX’s design offered a modification of flight-proven hardware (the Dragon capsule) which reduced development risk. Additionally, the sheer thrust power required to control the station favored the heavy-duty propulsion design SpaceX proposed.

Can we watch the ISS deorbit? It is unlikely to be visible from land because the target is the most remote part of the ocean. However, aircraft or ships in the vicinity might capture footage of the plasma trail as the station breaks apart. NASA will likely provide telemetry and simulations during the event.

Is it possible to save parts of the ISS? Small items and scientific experiments will be returned to Earth on cargo flights before the deorbit. However, the main modules are too large and heavy to bring back down safely. They were designed for space, not for the structural stress of landing.