CivilDebris

SpaceX Will Destroy The ISS

The International Space Station's Cupola, backdropped against black space, a horizon scene array and various components of the orbiting outpost, including Node 3 or Tranquility (on which the Cupola is mounted) and the Leonardo Permanent Multipurpose Module.
What goes up….Image: NASA.

SpaceX wouldn’t exist without the International Space Station: NASA’s need for an uncrewed cargo vehicle to supply the orbiting lab gave SpaceX the focus and funding it needed to develop the Falcon 9. 

It’s fitting, then, that NASA has entrusted Elon Musk’s company with the station’s (planned) destruction.

Buy to burn: NASA will pay SpaceX $843M to develop the US Deorbit Vehicle, which will be capable of pulling the station to a controlled demise in the Pacific Ocean. Unlike most SpaceX projects, NASA will own and operate this vehicle until it meets its end along with the ISS.

Right now, NASA and partners JAXA, CSA, and ESA plan to operate the station through 2030, while Roscosmos has only committed to participating through 2028. 

The space agency didn’t say if any other contractors had bid for the job, but the capabilities required would likely limit potential competitors to those already operating high-energy propulsion systems in orbit. It’s also not clear what SpaceX’s vehicle design will be, but one obvious candidate is Starship. 

Reference material: While much of the station is upgradeable, NASA engineers are most concerned about the primary structure of the station, which can’t be easily replaced, but has borne the brunt of decades of spacecraft dockings and thermal stress. 

The agency released a summary analysis on Wednesday that led to this concept of operations—briefly, the ISS is too big to simply leave its reentry to chance, since it could threaten people on the ground, or to boost to a permanently higher orbit, where debris is a bigger problem. It’s too complex to disassemble, and too old to be usefully repurposed. 

The agency says there is a chance that the station will remain operational past 2030, particularly if commercial alternatives aren’t yet available in orbit, and NASA is working on plans to support ongoing operations while keeping the deorbit vehicle waiting in the wings. 

Quotable: “NASA’s Orbital Debris Program Office calculates that the complete destruction and/or fragmentation of the 420-ton space station while in orbit would generate approximately 220 million pieces of debris greater than 1 mm in size. The current estimate of the total amount of debris in Earth orbit 1 mm and greater is about 100 million pieces.” Yikes. 

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