Circular Space Economy 101

Overview of a Circular Economy

Circular Space Economy Glossary

Acronym	Meaning
CE	Circular Economy
LE	Linear Economy
EOL	End-of-Life
CSE	Circular Space Economy
OCE	Orbital Circular Economy
LEO	Low Earth Orbit
GEO	Geostationary Orbit
CCE	Cislunar Circular Economy
LCE	Lunar Circular Economy
ISRU	In-Situ Resource Utilization
ISAM	In-Space Servicing, Assembly, & Manufacturing
ADR	Active Debris Removal
OOS	On-Orbit Servicing

What is a Circular Economy?

A Circular Economy (CE) is an economic system designed to simultaneously eliminate waste and extend the lifespan of resources through continuous reuse, repurposing, repair, and recycling. Unlike the Linear Economy (LE), which follows a “take, make, dispose” model, a CE focuses on closing resource loops and ensuring that materials remain in use for as long as possible.

Core Principles of a Circular Economy

While there can be many different principles attributed to a CE, there are three core ones that need to be emphasized:

Eliminate Waste & Pollution: A circular approach promotes designing products, systems, materials, and other infrastructure in ways that prevent waste from being created in the first place. Whether through recycling or other means, designing waste & pollution out from the start is critical.
Maximize Resource Efficiency: A CE can support the extension of product and material lifespans through recycling, reusing/repurposing, servicing, etc.
Regenerate Natural Systems: Circularity can foster sustainability by designing extraction and manufacturing processes that help restore ecosystems and ensure long-term viability.

Linear vs. Circular Economic Models

What are the differences between a linear and circular economic model?

Linear Model: The traditional LE operates on a “take, make, dispose” model:

Take: Extract raw materials.
Make: Make products, other materials, systems, infrastructure, etc., with limited consideration for longevity or reuse.
Dispose: Discard items after use, generally in landfills or other traditional garbage disposal methods. This leads to waste accumulation.

Circular Model: In contrast to a LE, a CE follows a regenerative cycle, where resources are designed to stay in use rather than be discarded. A basic but memorable concept of a CE is “reduce, reuse, recycle”, which has been a long-time slogan for recycling plastics and other materials terrestrially.

Design for longevity & repair: Create modular, interoperable, repairable products.
Reuse & repurpose: Extend product life through servicing, maintenance, and other forms of upgrades.
Recycle & recover: Convert materials back into usable resources, whether metals, plastics, or other resources.

Introduction to a Circular Space Economy

What is a Circular Space Economy?

A Circular Space Economy (CSE) applies CE principles to space operations, ensuring that materials, spacecraft, and other space assets are reused, repurposed, repaired, or recycled instead of abandoned and/or left as space debris. By applying circular practices, the CSE aims to create more sustainability, longevity, and resource efficiency in space activities while mitigating the growing challenges associated with humanity’s rapid expansion into space.

A CSE represents the highest-level framework of what a circular economy in space is. It encompasses all space activities across all operational environments and domains (i.e., Earth, Moon, Mars, deep space, etc.). Within this overarching and high-level model are smaller and more specific domains that focus on particular areas of space that require tailored strategies for circularity. Here are some examples:

Orbital Circular Economy (OCE): The OCE focuses on Earth’s orbit, where the vast majority of space activities currently take place. The OCE addresses major issues such as orbital congestion, satellite EOL management, debris mitigation & removal, and more.
Cislunar Circular Economy (CCE): The CCE focuses on everything from Earth’s orbit to Lunar orbit. This includes activities around the Moon and within its gravitational influence, and in some strategies, the lunar surface itself. The CCE aims to develop sustainable infrastructure for lunar operations, including resource utilization and long-term mission support.
Lunar Circular Economy (LCE): The LCE is still an emerging concept area for a CE, but is a prime testing bed for CE principles in space exploration, given its status as our closest celestial body, and the only one humanity has ever set foot on (so far!). The LCE could focus on sustainable practices for lunar settlements and industries, such as in-situ resource utilization (ISRU), lunar habitat recycling, and more.

It should be noted that a CSE is broken down into smaller domains, such as the three above, since the CSE will take decades to come to fruition. Breaking a CSE down into incremental domains allows us to create a phased and actionable approach to making it possible. While the CSE is the ultimate goal and vision, it will take multiple stepping stones to get there. By utilizing our orbit, the cislunar environment, the Moon, and even Mars as stepping stones, it opens up the possibility of eventually achieving a true CSE.

Our Focus: While the CSE 101 provides a high-level overview, the Clean Orbit Foundation (COF) is committed to diving deeper into the CSE as well as the most pressing domains, the OCE and CCE. These two domains, specifically, are the immediate priority for the COF, as well as for space operators, as they are where sustainable and circular practices can have the greatest near-term impact.

Applying a Circular Economy to Space Operations

The need for CE principles in space operations is more urgent than ever. Specifically within Earth’s orbital domain, there are thousands of satellites already in orbit and tens of thousands more expected to be launched over the next two decades. The growing congestion of our orbit presents significant sustainability challenges. Additionally, the high costs and logistical difficulties of launching materials from Earth necessitate resource efficiency in space.

Importance of a Circular Space Economy

A CSE is more than just a change in economics, it has a fundamental impact on the environment, business opportunities, and much more.

Mitigating Orbital Congestion: Especially for our orbital domain, circular practices can significantly reduce the accumulation of space debris by servicing, repurposing, and recycling defunct satellites and spent rocket stages instead of leaving them as hazards in orbit. As humanity continues to look outward, we still need to ensure the sustainability of our orbital environment. Not to mention, future orbits such as on the Moon and Mars can benefit greatly from how we mitigate congestion in Earth’s orbit and the lessons we learn from doing so.
Extending Asset Lifespan: By servicing space assets, such as satellites or space stations, a CSE allows them to remain operational beyond our current estimates for their EOL, reducing the need for replacements, more launches, or other costly procedures.
Transforming Waste to Opportunity: A circular approach shifts the perspective on space operations, viewing debris and other discarded materials as not just waste and hazards, but as potential assets and resources too. This mindset shift can lead to innovative opportunities in fields such as In-Space Servicing, Assembly, & Manufacturing (ISAM), resource extraction, and new infrastructure developments.

Drivers of a Circular Space Economy

What is driving the push for a CSE?

Rising Space Debris Concerns: The recent and ongoing exponential increase in space traffic has led to growing concerns about space debris, which poses a major risk to both current and future missions. Implementing circular principles can help manage and mitigate these risks by promoting active debris removal, in-space recycling, and sustainable satellite design.
Resource Scarcity: Space resources are inherently limited, and despite decreasing launch costs, sending materials into orbit remains expensive. A CSE encourages the use of existing in-space materials, reducing dependency on Earth-based supply chains and promoting self-sustaining operations.
Economic & Environmental Benefits: A fully developed CSE can provide significant long-term financial savings by reducing material waste and operational costs. Additionally, by minimizing pollution and maximizing resource efficiency, a CSE fosters a more sustainable and responsible approach to space exploration.

Key Components & Concepts of a CSE

Key Concepts of a CSE

These are the foundational ideas that drive circularity in space operations (note that this is not an exhaustive list):

Closed-Loop Ecosystem: A self-sustaining system where materials, resources, and energy are continuously reused and repurposed rather than discarded.
Lifecycle Management: Designing, maintaining, and repurposing space assets to maximize their lifespan and value over time. This includes incorporating the ideas of modularity, repairability, and recyclability into the design of space assets from the outset (in other words, designing for circularity).
Resource Efficiency & Waste Minimization: Maximizing the use of materials to reduce any waste, prevent orbital congestion, and foster sustainability in orbit.
EOL & Life Extension Evolution: Strategies that evolve past deorbiting or leaving assets in orbit, such as asset removal at EOL, servicing, upgrades, or other means.

Key Components of a CSE

These are the technologies and operational strategies that enable circularity in space (note that this is also not an exhaustive list):

ISAM: ISAM is the combination of many technologies and activities in servicing, assembly, and manufacturing, including satellites, spacecraft, and other space infrastructure. It is the concept that paves the way for many sustainable space operations in our orbit, cislunar space, the Moon, and beyond.
- Modularity & Standardization: Space assets need to be designed with interchangeability and interoperability in mind to simplify repairs, upgrades, recycling, etc. Without them, a CSE will struggle to become a reality.
- Repairability & Servicing: Leveraging capabilities for inspecting, repairing, refueling, and servicing assets to extend lifespans.
- Recyclability & Reusability: Developing methods to recycle and/or repurpose materials. For example, solar panels, fuel, or some metals are great to consider for this at EOL.
Sustainable Materials: Developing advanced materials that are both optimized and proven for reusability, recyclability, and durability in all space environments.
Space Debris Management: Active Debris Removal (ADR) and debris mitigation strategies are crucial to ensure sustainable space environments, especially in Earth’s orbit, where the vast majority of space activities currently happen.

NOTE: The concepts and components of a CSE will be discussed in further detail in the future.

Challenges & Benefits of a CSE

Challenges

A CSE presents numerous opportunities, but its successful implementation faces several key challenges spanning technological, policy, and economic domains.

Technology Challenges:

Immature Technology: Many of the technologies required for a fully functional CSE, such as in-space manufacturing, autonomous servicing, and advanced recycling systems, are still in the early stages of development.
ISAM: Capabilities like ADR, On-Orbit Servicing (OOS), Orbital Platforms, and robotic repairs are not yet widely available or economically viable at scale.
Insufficient Standards for Space Assets: A lack of standardized and modular design practices makes it difficult to develop interoperable and repairable space assets.

Policy Challenges:

Absence of Comprehensive Global Standards: Without internationally agreed-upon policies for recycling, servicing, and repurposing assets in space, coordination among stakeholders remains a challenge.
Lack of Global Agreement on Ownership & Transfer Rights: There are currently no universally accepted frameworks for ownership and transfer of repurposed or salvaged space materials.
Regulatory Barriers: Some mandatory disposal laws, originally intended to prevent space debris, may inadvertently hinder circular practices by requiring deorbiting instead of refurbishment or reuse.

Economic Challenges:

High Initial Investment Costs: Developing the necessary infrastructure and technology for a CSE requires significant capital investment.
Uncertain Return on Investment (ROI): While long-term cost savings and sustainability benefits are clear, short-term return on investment remains uncertain, making it challenging for companies to justify immediate large-scale investments.

Benefits

Despite these challenges, a CSE offers substantial benefits that contribute to a more sustainable and economically viable space environment.

Technological and Operational Benefits:

Interconnected Ecosystem: A CSE fosters a cohesive network of satellites, space stations, platforms, and supporting infrastructure working together seamlessly.
Extended Asset Lifespan: In-space servicing and repairs reduce the need for premature asset replacement, enhancing mission efficiency.
Reduced Risk of Debris & Orbital Congestion: Circular practices reduce the number of defunct satellites and other debris left in orbit.
Lower Operational Costs: By repairing and reusing materials in space, organizations can cut down on costly resupply missions from Earth.

Economic Benefits:

Creation of New Markets: Industries such as ISAM, OOS, in-space recycling, and orbital logistics will generate new economic opportunities and jobs.
Sustainable and Scalable Business Models: A CSE enables long-term profitability by shifting from single-use to regenerative business models.

Strategic and Logistical Benefits:

Reduced Dependence on Earth-Based Launches: By maximizing the use of in-space resources, a CSE decreases the reliance on costly and environmentally impactful Earth-based supply chains.
Reduced Collision Avoidance: With less debris and defunct objects roaming Earth’s orbit and improved traffic management and situational awareness technologies, there would be a possible sharp decrease in collision avoidance maneuvers (at least manual), which are already reaching alarming levels today. This would not only reduce logistical constraints but would also bring major savings to all space operators.
Enhanced Space Sustainability: By prioritizing reuse and efficient resource management, a CSE ensures a long-term, viable future for human activity in space.

Increased International Cooperation: By establishing standards and agreements that enable the creation of a CSE, the spacefaring nations of the world have an opportunity to come closer together and allow for the continued progression of space exploration to be unified.

In summary, while there are clear challenges to implementing a CSE, the long-term benefits, ranging from economic and operational efficiency to environmental and strategic advantages, make it a crucial model for the future of sustainable space activities.

Future Content

The Circular Space Economy (CSE) is still in its early stages, but its potential to revolutionize space operations is undeniable. This CSE 101 content only scratches the surface of what is a vast and evolving economic and sustainable model for space exploration. As a complex and emerging framework, the CSE requires ongoing exploration, development, and strategic implementation.

However, not all aspects of the CSE are distant concepts. The Orbital Circular Economy (OCE) and Cislunar Circular Economy (CCE) are pressing priorities today. On top of breaking down the CSE further in future education content, we will also dive deeper into the OCE and CCE concepts. These domains demand immediate attention as they address current challenges that take place from Earth’s orbit to the Lunar surface, making them the most actionable stepping stones toward a fully realized CSE.

At the Clean Orbit Foundation, we are committed to providing the most up-to-date insights and strategic guidance on the CSE and its critical subdomains. Through research, advocacy, and collaboration, we aim to accelerate the transition from today’s linear economic model to a truly circular ecosystem in space. Join us in shaping the future of sustainable space operations, and feel free to reach out to contribute to this vital conversation.