The first commercial space station, Haven-1, is now undergoing assembly for launch
As Ars reported last week, NASA's plan to replace the International Space Station with commercial space stations is running into a time crunch.
The sprawling International Space Station is due to be decommissioned less than five years from now, and the US space agency has yet to formally publish rules and requirements for the follow-on stations being designed and developed by several different private companies.
Although there are expected to be multiple bidders in "phase two" of NASA's commercial space station program, there are at present four main contenders: Voyager Technologies, Axiom Space, Blue Origin, and Vast Space. At some point later this year, the space agency is expected to select one, or more likely two, of these companies for larger contracts that will support their efforts to build their stations.