Sustainable Space Operations: Navigating Emerging Technologies, Debris Management, and Governance Challenges for the Future.
Martin-Lawson, Darrell (2026) Sustainable Space Operations: Navigating Emerging Technologies, Debris Management, and Governance Challenges for the Future. Doctoral thesis, Birmingham City University.
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Abstract
The sustainability of Earth’s orbital environment has emerged as one of the defining challenges of 21st-century space activity. As space becomes increasingly commercialised, privatised, and accessible, our space orbits, once perceived as vast and inexhaustible, are showing signs of critical stress. This thesis investigates the multifaceted dynamics shaping sustainable orbital operations, examining the projected risks of orbital overcrowding, the future of space tourism, and the role of patent-driven technological innovation in addressing space debris. Together, these dimensions form an integrated framework for understanding how humanity can navigate the tensions between innovation, exploitation, and preservation in outer space.
This thesis is structured as three independent but related papers that explore the sustainability challenges of space, defined in this thesis as Earth’s orbital environment rather than the practically infinite expanse of deep space. The sustainability challenges of space are explored, through the lens of emerging technologies, debris management, and governance challenges, this research aims to inform readers on the complexities and opportunities for sustainable space development. The first paper (chapter 2) focuses on the issue of orbital crowding and debris, presenting Earth’s orbit as a finite, congested resource and a textbook example of an Area Beyond National Jurisdiction (ABNJ). A version of this paper was published as (Martin-Lawson et al., 2024). It employs a probability-based empirical model, this section forecasts the trajectory of orbital object accumulation and identifies the impending approach of a ‘critical density’ threshold beyond which chain-reaction collisions could render key orbital bands unusable. The model projects that, in the absence of comprehensive debris management strategies, this tipping point may be reached within the next decade, significantly endangering the usability our orbits and in particular the use of low Earth orbit (LEO). The analysis further estimates the economic costs of active debris removal (ADR) and evaluates the limited efficacy of current technical interventions when separated from legal and institutional reforms. It argues that technological advances, while essential, are insufficient on their own. Lasting sustainability will require a radical overhaul of fragmented international legal frameworks that were never designed to govern the complexities of a commercial and contested orbital domain.
The next paper (chapter 3) focuses on space tourism, a rapidly growing frontier that reflects both the potential up and downsides of commercial space access. Drawing on over two decades of scholarly literature, this section identifies conceptual, regulatory, and environmental blind spots that hinder the sector’s sustainable development. Despite considerable enthusiasm and investment, space tourism lacks a cohesive theoretical foundation or robust sustainability framework. Through a network analysis and thematic synthesis, the research proposes four critical dimensions to guide future inquiry: 1) conceptual clarity on what constitutes space tourism, 2) the integration of environmental sustainability metrics, 3) risk mitigation strategies for spaceflight and infrastructure, and 4) affordability pathways for broader accessibility. These findings call for a reimagining of space tourism not merely as a luxury enterprise, but as a component of a sustainable and inclusive space economy.
The final paper (chapter 4) provides a quantitative analysis of innovation trends in debris management technologies, using a custom-designed DBSCAN clustering algorithm applied to patent data from spacefaring nations. Patents were classified into three functional categories, prevention, mitigation, and removal, and clustered based on both textual and structural similarities. The results reveal a global innovation landscape dominated by removal and mitigation strategies, with prevention technologies notably underrepresented. Regional comparisons show differing technological emphases: China and the EU lead in hardware-intensive removal technologies, while the US focuses more heavily on tracking and shielding systems. This imbalance points to a structural misalignment between technological development and long-term sustainability goals, as preventing debris at its source remains the most cost-effective and scalable solution. The study underscores the need for international economic incentives, such as space sustainability-linked taxes, orbital access restrictions, or funding schemes, to stimulate innovation in underinvested areas and align private sector R&D with global public interests.
Across its three papers, this thesis makes the case that sustainable space operations cannot be achieved through technological advancement or policy reform in isolation. Instead, it argues for an integrated approach that recognises the interconnected nature of tourism, congestion, innovation, and governance. The thesis contributes to both theoretical and applied debates by combining foresight modelling, legal analysis, and empirical patent clustering, offering a multidisciplinary framework for future research and policymaking. It concludes that safeguarding Earth’s orbital environment will require not only more effective regulation and international coordination, but also a shift in mindset from viewing space as an unlimited frontier to treating it as a fragile, shared ecosystem in need of careful stewardship.
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