Orbital Reef: Building the Next Commercial Space Frontier
Since its assembly began in 1998, the International Space Station has stood as the largest structure ever placed in Earth’s orbit, hosting more than 250 individuals from over 20 nations and enabling upwards of 3,000 research investigations. Many of these have yielded breakthroughs in diverse fields, from protein crystal growth studies that informed treatments for multiple diseases, to space-based research on Alzheimer’s, Parkinson’s, cardiovascular conditions, and various cancers. The station has also pioneered new capabilities—tissue chips in microgravity, quiescent colloid experiments, additive manufacturing in orbit, advanced water purification systems, and the operational knowledge required for long-duration human habitation in space.
With NASA planning to retire the ISS in 2030, attention has shifted to sustaining a permanent human presence in low Earth orbit (LEO). The agency’s Commercial LEO Destinations (CLD) Program is central to this transition, aiming to replace the ISS with commercially owned and operated platforms that meet NASA’s needs for science, technology maturation, and astronaut training. Early steps included a 2020 contract to Axiom Space for modules to be attached to the ISS, followed by the 2021 launch of the Commercial Destinations–Free Flyer program. In December 2021, NASA awarded Phase 1 design contracts to Northrop Grumman, Nanoracks’ Starlab, and Orbital Reef. Phase 2 will certify one or more platforms for government astronaut use, delivering integrated services such as transportation, ground support, and on-orbit operations. The goal is to maintain at least two crew members in LEO, conducting roughly 200 scientific investigations annually, with operational readiness targeted for the late 2020s.
Among these initiatives, Orbital Reef stands out as a mixed-use business and research park in orbit, conceived as one of the first commercial free-flying space stations. Developed by Blue Origin in partnership with Sierra Space, Boeing, Redwire Space, Amazon Supply Chain, Genesis Engineering, and Arizona State University, its name reflects the vision of a self-reinforcing orbital ecosystem akin to a coral reef. By offering turnkey infrastructure, Orbital Reef aims to lower barriers for both established and emerging users, enabling ventures that range from basic and applied research to entertainment, hospitality, and acting as a port-of-call for exploration missions.
The station will host a blend of professional crew, national astronauts, and commercial occupants. Its capabilities are designed to match and extend those currently available on the ISS, ensuring continuity for research and technology development. The initial configuration will include five primary elements: a Node, Sierra Space’s Large Integrated Flexible Environment (LIFE™) habitat, Blue Origin’s Core module and power/thermal Mast, and Boeing’s Research Module.
The Core module, with 250 cubic meters of habitable volume—about one-third that of the ISS—will function as the central hub for visiting vehicles and other modules. It will house command and control systems, data processing, and communications, alongside environmental controls to support up to ten crew members. Six expansive Earth-facing windows will provide observation and outreach opportunities. The Research Module, comparable in size to the Core, will feature a payload airlock and cupola, serving as a multi-disciplinary laboratory adaptable to user requirements.
The Mast will deliver 100 kilowatts of electrical power via deployable solar arrays, manage thermal regulation, and host critical systems including communications, an external robotic arm, and docking infrastructure. Sierra Space’s LIFE™ habitat will expand to offer over 300 cubic meters of space, accommodating research facilities, crew quarters, hygiene compartments, a galley, exercise equipment, and plant growth systems. The Node, at approximately 40 cubic meters, will provide two International Docking System Standard ports, an extravehicular activity airlock, external payload hosting, and station-keeping functions.
Orbital Reef’s modular design supports scalability through the addition of Core and Mast units, each capable of supporting further tenant modules. This architecture allows capacity and functionality to grow in step with market demand, positioning Orbital Reef as a cornerstone of the emerging commercial LEO economy.
