Developing a community roadmap for human reproduction beyond Earth

01

Current Context for Human Reproduction and Sexual Health in Space, A Global Perspective

We (the authors) assume at some point in the future (over the coming decades to centuries), humanity will become a multiplanetary species, that is, the full human life-cycle, from the first formation of the germline through conception, birth, childhood, adulthood, old age, and death, will happen beyond Earth. Such an expansion of human presence beyond Earth raises profound biological, scientific, ethical, and societal questions regarding human reproduction. To date, human space missions were conducted primarily by government space agencies for scientific, exploration, and geopolitical purposes. In this era of professional astronauts, any consideration of human (and associated mammalian) reproduction in space was viewed primarily as a scientific research activity.

However, with recent developments and trends, the context is shifting rapidly:

Changing costs and frequency of accessing space

Access to space is being revolutionised by significantly reduced financial costs, increasing launch frequencies, and greater payload capacities. This is exemplified by "New Space" models and vehicles like SpaceX's Starship, which have the potential to transport many tens of, potentially more than a hundred, people into space per flight. The presence of multiple actors in space logistics and transportation is driving down costs, a trend that continues as competition intensifies.

Multiplanetary ambitions

Governments and private players aim to establish bases on the Moon and Mars, meaning human populations will soon be spending considerable, extended periods of time living and working beyond Earth.

Space tourism and sexual health

As orbital space tourism and even space hotels are expected to become operational within the coming decade, there is a pressing need to explore and mitigate unplanned conceptions. It is highly plausible that future leisure spacefarers may engage in sexual activities that could lead to intentional or unintentional conception beyond Earth.

Broadening of access to space

The rapid broadening of access to space means it is no longer solely the domain of professional astronauts. Future spacefarers will have very different motivations for being in space and varying approaches to compliance with peer and societal norms. Ensuring people and communities can thrive in space requires proactive consideration of issues related to sexual health and sexual activities.

Biological and physiological challenges

Decades of research indicate that microgravity and cosmic radiation significantly affect mammalian reproductive processes, which serve as a critical proxy for understanding human reproduction. We know from evidence in rodent and amphibian models that factors such as oocyte maturation, sperm motility, and early embryonic cell differentiation are compromised in space. However, there is still a vast amount we do not know. Beyond conception and early embryonic development, other critical aspects of the full human life-cycle, such as early childhood development and the ageing process, have hardly been considered in existing space research. Historically, research in this area has been severely constrained by a limited number of flight opportunities, resulting in small sample sizes and a lack of coordinated, long-term experiments. Looking forward, the "New Space" paradigm offers the potential for a significantly greater scientific return, allowing for the coordinated, larger-scale studies needed to start addressing our major knowledge gaps regarding the effects of altered gravity and increased cosmic radiation exposure.

Earth-bound medical benefits

It is also possible that studying human reproduction in the extreme environment of space may yield significant spin-offs for terrestrial medicine. For instance, the development of highly automated, miniaturised, and robust In Vitro Fertilisation (IVF) and associated technologies anticipated for future space communities could significantly improve the accessibility, affordability, and success rates of fertility treatments on Earth. From a scientific viewpoint, this research may not only help humanity thrive off-world but may also drive innovations that address complex medical, fertility, and psychological issues associated with reproduction on Earth.

Societal evolution

Different human societies have distinct cultural sensitivities regarding sexuality and the process of human reproduction. As space access broadens to include a larger and more diverse representation of humanity, it presents an opportunity to conduct culturally inclusive studies on human reproduction, sexuality, and sexual health in space.

Reproductive rights and justice

The prospect of space settlement introduces legal and ethical dilemmas regarding the rights of the unborn child. Conceiving a child in a highly hazardous space environment, characterised by dangerous radiation levels and microgravity, will face intense societal scrutiny.

"We appear to be at a major crossroads, moving from sixty-plus years where humans in space had little relevance to reproduction outside of scientific curiosity, to a near future where humans from diverse backgrounds will be living in space and where aspects of human reproduction and sexuality will be operationalised."

We propose that human society is currently poorly prepared for this transition. The speed and pace at which technology and changing global geopolitics are evolving mean that humanity's ability to access and live in space in the near future has outstripped our scientific, ethical, and operational understanding of the reproductive consequences. There are, therefore, significant risks of unexpected consequences emerging across scientific, ethical, and operational domains. Consequently, timely, proactive, and coordinated action is required to address these impending challenges, which forms the basis for the work presented here.

02

The Proposed Need to Network Global Activities and Roadmap Proposed Activities and Milestones

Addressing the challenges outlined in Section 1 requires a consolidated, timely effort from a broad and diverse range of communities. Currently, many scientists, engineers, technologists, reproduction professionals, entrepreneurs, ethicists, and futurists worldwide are exploring these fields, yet their activities are often isolated within specific disciplines, sectors, and national boundaries. This lack of a unified network or community means that research and policy development are frequently disjointed. Furthermore, a divide between spacefaring and currently non-spacefaring nations limits global stakeholder engagement and diverse representation.

Critical research into the effects of the space environment on human and mammalian reproduction remains highly fragmented, meaning the limited resources currently deployed across the globe are often used inefficiently. A clear indicator of this historical lack of global coordination is the landscape of international scientific gatherings. While broad aerospace and space medicine conferences frequently occur, there has been an absence of dedicated, interdisciplinary events focused specifically on human reproduction beyond Earth. This absence may reflect a longstanding legacy in which reproductive topics have historically been regarded as secondary priorities relative to other, more immediately operational aspects of spaceflight safety, such as radiation shielding, cardiovascular adaptation, or musculoskeletal integrity, concerns that, given the short duration of early missions and the professional profile of their crews, naturally commanded greater urgency and institutional attention.

If a framework existed to connect and encourage these isolated activities, the global community could better utilise its limited resources, ensuring that the collective impact is far greater than the sum of its individual parts. To achieve this, we propose the development and subsequent maintenance of a public-domain, community-led roadmap focused on advancing knowledge of human reproduction beyond Earth. To clarify, in this context, we define this "roadmap" as a strategic, evolving framework designed to identify critical knowledge gaps, align global research priorities, and map out necessary interdisciplinary milestones. This roadmap is envisaged as a practical and living tool to pragmatically network global activities and address the complex questions raised in the previous section.

Ultimately, the goal of this roadmap is not to dictate rigid rules for future spacefarers, operators, and societies, but rather to serve as a shared navigational framework. By systematically exploring interconnected domains, the biological processes of reproduction, and the medical and operational protocols relevant to sexual health, this roadmap aims to build a comprehensive foundation of knowledge that will empower and inform future decision-makers, stakeholders, and operators to make better-informed choices regarding what is safe, ethical, and appropriate for human expansion into space.

Foundational principles

To bring this collaborative vision to life, the roadmap is built upon several foundational principles:

• Fostering inclusive collaboration. While government space agencies often remain cautious about addressing human reproduction directly, the commercial space sector and independent research communities are advancing rapidly. A community-led roadmap actively bridges these gaps, providing a neutral, shared space where all actors can contribute equally, driven by shared goals rather than top-down directives.
• Amplifying global resources. By gently aligning global activities towards shared milestones, the community can minimise duplicated efforts and pool limited funding much more effectively. Crucially, this collaborative approach ensures that diverse, cross-cultural perspectives are woven directly into the foundation of multiplanetary reproduction.
• Engaging regulatory and governing bodies. Much like think tanks that inform and shape public policy without holding direct regulatory authority, this community is positioned to play an analogous role in human spaceflight, generating evidence-based knowledge, framing key questions, and raising awareness on reproductive topics that can then inform the decisions of governing and regulatory bodies. The roadmap must actively foster dialogue with both major space entities (such as UNOOSA, NASA, and ESA) and global and national health and reproductive oversight bodies (such as the World Health Organization, or national fertility regulators like the HFEA in the UK or ASRM in the US).

03

A SpaceBorn United Community Network to Initiate and Coordinate the Roadmap

Recognising the void in global coordination and dedicated forums, SpaceBorn United (SBU) initiated efforts to actively bridge these isolated disciplines and foster a global community. SBU is a commercial research and development organisation based in the Netherlands that focuses on advocating for the timely consideration of human reproduction beyond Earth and studying its various biological stages in space. Over the past decade, SBU has actively cultivated a growing and informal but broad global network through proactive media engagement and the organisation of community events and meetings. Scientifically, SBU's research is centred on its ARTIS (Assisted Reproductive Technology In Space) programme, which investigates how assistive human reproduction technologies can be adapted and leveraged for use beyond Earth, thereby helping to capture and elevate emerging thoughts and insights from this unique perspective.

Building upon this foundation of research and community engagement, SBU and its growing network of international partners recognised the pressing need for the coordinated framework proposed in Sections 1 and 2. To transition from isolated discussions to actionable, unified progress, SBU founded the Space Reproduction Roadmap Consortium (SRRC). The immediate goal of the SRRC, supported by founding partners including Cranfield University, UZ Gent, Progenesis, SES, and the EarthLight Foundation, was to initiate the development of the first iteration of this community roadmap. The foundational pillars of this roadmap are outlined in Section 4, followed by the methodology used to convene these experts and draft this version 1.0 framework in Section 5. The resulting preliminary roadmap and its key milestones form the core of the remainder of this document.

04

The Four Foundational Pillars of the Initial Roadmap

To successfully transition from fragmented research to a cohesive strategy, the SRRC recognised that human reproduction in space cannot be approached merely as an isolated biological challenge. Rather, it is a highly complex, systems-level problem requiring an integrated, multidisciplinary architecture. Consequently, to ensure a holistic approach and to provide a structural framework for both the roadmap itself and the inaugural symposium (detailed in Section 5), the initiative is organised around four interconnected, foundational pillars.

While this architecture is designed to eventually support the full "germline-to-grave" human life-cycle, the activities and milestones detailed within these pillars for this initial version (v1.0) of the roadmap are intentionally constrained to the "gamete-to-birth" stages. Future iterations of the roadmap will not only expand the scope of these initial four pillars but are also expected to introduce additional pillars, such as those dedicated to psychology, societal dynamics, and sexual health, to fully encompass the complete continuum of human reproduction beyond the Earth.

1. Biomedical Science. Investigating gametogenesis, fertilisation, and embryonic development under conditions of microgravity, altered gravity, and elevated cosmic radiation, utilising both human data, robust mammalian proxy models, and exploring future clinical reproductive medicine strategies.
2. Space Technology. Developing the necessary life-support and clinical infrastructure, including automated IVF platforms, microfluidic "organ-on-a-chip" diagnostic devices, space analogues, and advanced bio-containment habitats.
3. Ethics & Legal. Addressing bioethical standards, the legal rights and protections of unborn spacefarers, and the development of internationally agreed regulatory statutes and societal norms to govern human reproduction beyond Earth.
4. Space Business & Geopolitics. Establishing sustainable funding and commercial models, navigating complex international intellectual property (IP) protection, and managing the geopolitical implications of multiplanetary expansion.

05

Methodology of Initial Roadmap Production

The production of this initial (v1.0) roadmap utilised the following methodology:

Initial conceptualisation

In early 2025, preliminary discussions within the existing SBU network identified the value of a formalised roadmapping activity. The network concluded that convening a dedicated online symposium would be a suitable approach to gather interdisciplinary insights and establish a foundational consensus.

Participant selection and symposium organisation

To ensure broad coverage of the complex issues involved, an invited participant list was curated. Rather than relying on a general open call, international experts were specifically identified to provide an appropriate breadth of expertise across reproductive medicine, fertility research, space biology, space technology, bioethics, geopolitics, and law. Ultimately, approximately 35 experts participated in the online symposium held across two half-days on 26 and 28 September 2025, a structure designed to allow time for reflection between sessions. The full participant list and their respective affiliations will be included as an appendix in the final document.

Workshop structure and execution

The symposium was designed to foster iterative, interdisciplinary discussions. Each half-day commenced with introductory presentations and plenary sessions to establish a shared context. Following this, participants were split into parallel, targeted breakout sessions categorised into Space Technology, Biomedical Sciences, Space Business & Geopolitics, and Ethics & Law. Within these groups, experts were tasked with identifying core challenges and estimating realistic timelines for roadmap building blocks within the focused scope of the early stages of human reproduction in space. The groups then reconvened in plenary sessions to present, discuss, and debate their respective findings. To ensure the nuances of these debates and the resulting consensus points were captured appropriately, all online sessions were recorded, using automated transcription tools to create detailed records for subsequent analysis.

Refinement

Following the symposium, the insights and proposed milestones generated by the participants were consolidated into this document and circulated among the participating experts and authors for iterative refinement. To foster transparent community engagement, the finalised version 1.0 of this roadmap will be self-published on a public-domain scientific repository (specifically, the CERN-based Zenodo server), where it will be assigned a permanent Digital Object Identifier (DOI). This open-access publication strategy ensures that the wider scientific, regulatory, and spacefaring communities can quickly reference, debate, and build upon these foundational steps. Crucially, placing this document into the public domain to invite broader community validation and feedback is an important next step; these diverse global insights will directly drive the continuous revision, refinement, and expansion of the roadmapping activity into the future.

06

Version "One" of the Roadmap

While the ultimate vision of this community effort is to address the complete "germline-to-grave" human life-cycle beyond Earth, this initial version (v1.0) of the roadmap is deliberately focused. The term "germline" is used purposefully instead of "gamete" to acknowledge the continuous lineage and vulnerability of reproductive precursor cells across generations. By focusing on the germline, we explicitly recognize that environmental space exposures (such as cosmic radiation) can have multi-generational impacts long before fully mature gametes (sperm and eggs) even develop.

To provide a pragmatic and actionable starting point, v1.0 targets the earliest and most critical biological milestones of this continuum: pre-conception, conception, and early embryonic development. Future iterations of the roadmap will be systematically updated to expand this scope, providing greater emphasis on later aspects of the full life-cycle, including gestation, birth, childhood development, and ageing in extraterrestrial environments.

Based on the robust discussions and consensus generated during the inaugural SRRC symposium, the initial building blocks of this roadmap have been structured around the four foundational pillars introduced in Section 4. The following subsections detail the core challenges, strategic pathways, and immediate actions required across the biomedical, technological, ethical, and business domains to advance our understanding of these critical early reproductive stages.

6.1 Biomedical Science

Challenge. Understanding the isolated and synergistic effects of microgravity, partial gravity, and cosmic radiation on gametogenesis, fertilisation, and early pre-implantation embryo development, while establishing robust operational protocols.

Strategic content. The biomedical roadmap focused on establishing a systematic progression from foundational science to eventual clinical application. The group established four distinct biomedical pathways:

1. Prioritising foundational data generation. The consensus highlighted a critical strategic distinction: near-term efforts must focus strictly on generating fundamental data regarding human embryo development in space, rather than immediately pursuing the clinical or "medical path" of a full pregnancy. Gathering robust data on early cleavage and blastocyst formation is essential to build scientific credibility, raise awareness, and secure the necessary funding for later stages.
2. Systematic mammalian proxy baselines. Building on historical research, the community must mandate extensive data building using rodent and other mammalian models in true space environments. These models are crucial for understanding multi-system biological responses (e.g., fluid transport, bacterial control, and microbiome dynamics) under stress before any human clinical research is sanctioned.
3. In vitro validation and Earth-conceived embryos. While natural conception requires less immediate infrastructure, it exposes the highly sensitive processes of gamete fusion to unmitigated environmental stressors. Consequently, the roadmap prioritises in vitro models. A key milestone is to systematically validate the developmental viability of Earth-conceived embryos launched into space versus those fertilised directly in microgravity, isolating the specific variables that cause developmental arrest.
4. Agile translational workflows. To accelerate progress, ground-based biomedical research must evolve in tight synchronisation with space equipment developers. By fostering direct, agile communication between biological researchers and hardware engineers, the community can circumvent the bureaucratic paralysis often associated with traditional, large-scale governmental space agency cultures.

Immediate action. Establish baseline viability data by accelerating the use of microfluidic organ-on-a-chip devices and mammalian animal models (such as rodents) in ground-based analogues. Crucially, this must be coupled with a strategy that prioritises early embryonic data generation to secure broader scientific funding and consensus before attempting clinical pregnancy pathways.

6.2 Space Technology

Challenge. Developing miniaturised, bio-secure, and highly automated infrastructure to study the reproductive continuum in space, whilst establishing the life-support parameters required for eventual off-world gestation.

Strategic content. The technological roadmap focused on bridging the gap between terrestrial clinical infrastructure and the stringent constraints of spaceflight (mass, volume, power, and crew time). The group established four distinct technological pathways:

1. Fractional gravity thresholds in LEO. While advanced habitats with massive rotating modules for 1G artificial gravity are long-term aerospace goals, the immediate requirement is to deploy variable-gravity centrifuges within Low Earth Orbit (LEO). This infrastructure is vital to determine if early reproductive mechanisms observe a biological threshold between microgravity, lunar gravity (1/6G), and Martian gravity (1/3G), allowing engineers to de-risk future planetary surface operations.
2. Microphysiological Systems (MPS) & synthetic models. To circumvent ethical limitations and achieve high-throughput parallel experimentation, the community must transition heavily to "on-a-chip" technologies. The roadmap advocates for developing a modular toolkit, such as testis-on-a-chip, ovary-on-a-chip, and womb-on-a-chip. Crucially, these must be paired with Synthetic Human Entities with Embryo-like Features (SHEEFs, e.g., blastoids) to ethically model the mechanics of human implantation and placental formation without using viable human embryos.
3. Active exploration & terrestrial leverage. Recognizing that the space sector lacks the resources to independently invent advanced Assisted Reproductive Technologies (ART) like artificial wombs, the core strategy must be "active exploration." The space community will continuously monitor Earth-based ART developments and adapt them as "worked examples" for space validation. This iterative process builds operational readiness and creates a feedback loop that may yield terrestrial medical spin-offs.
4. Synthetic hibernation (long-term). The group identified synthetic hibernation (induced torpor) as an emerging, long-term technological strand. As space agencies investigate this for deep-space transit and radiation mitigation via induced hypoxia, the roadmap must systematically assess how such artificially lowered metabolic states impact gamete viability, fetal development, and the reproductive capacity of spacefarers upon waking.

Despite the strong emphasis on MPS, the consensus also reinforced that studying the full nine-month gestation period still necessitates maintaining the technological infrastructure to support whole-mammal populations (e.g., rodents) in space environments.

Immediate action. Prioritise the development and deployment of high-throughput, automated microfluidic "on-a-chip" systems and fractional-gravity centrifuges in LEO, whilst establishing active partnerships with terrestrial fertility researchers to adapt their latest ART platforms for space validation.

6.3 Ethics & Legal

Challenge. Reconciling the long-term necessity of multi-generational spaceflight with the immediate ethical and legal constraints regarding human gametes, embryos, and potential genetic interventions.

Strategic content. The ethical roadmap focused on establishing a robust framework that can navigate both near-term biotechnological capabilities and long-duration mission paradigms. The group established four distinct ethical pathways:

1. Stepwise protocol for Earth-based analogues. A significant challenge is the lack of universally accepted statutes governing human reproductive research in space. Therefore, the immediate necessity is to enforce a strict, stepwise ethical protocol. This protocol mandates that Earth-based analogues, synthetic embryo models, and mammalian proxies are exhaustively utilised to gather baseline data before any viable human biological material is exposed to the space environment.
2. Mitigating "jurisdictional ambiguity." The group highlighted the pressing need to address the risk of ethical fracturing. As commercial space entities operate with increasing agility, there is a risk that private actors might bypass the stringent institutional review boards (IRBs) traditionally mandated by governmental space agencies like NASA, ESA, and JAXA. The roadmap must seek to bridge this gap through a unified approach.
3. Navigating advanced biotechnologies. A crucial debate focused on the ethical boundaries of applying advanced biotechnologies, such as genetic screening, regenerative medicine, or gene therapies for enhanced radiation resistance, at the gamete or early embryo stage. While these interventions might theoretically become necessary for deep-space survival, they introduce profound moral, legal, and human rights complexities regarding germline modification that must be proactively addressed.
4. Long-term, multi-generational perspectives. The discussions acknowledged that the ethical justification for off-world reproductive research must be explicitly tied to intergenerational viability. The appeal of the "longtermist" argument for multiplanetary expansion requires that existing Earth-based bioethics treaties be updated to account for the extreme hazards of space and the unique rights of unborn spacefarers.

Immediate action. Formulate a unified, internationally recognized "Space Bioethics Code of Conduct" focused on the handling, research, and potential genetic modification of gametes and early embryos in space. This framework must bridge the gap between commercial innovation and governmental oversight, providing a transparent, phased approval process for future extra-terrestrial experiments.

6.4 Space Business & Geopolitics

Challenge. Securing sustainable funding models, driving public consensus, and establishing equitable frameworks for intellectual property and international collaboration over a multi-decade timeframe.

Strategic content. Executing a roadmap of this magnitude requires robust financial, technological, and narrative strategies. The group established four distinct business and geopolitical pathways:

1. Strategic storytelling and public consensus. A core theme was the power of narrative to drive change, innovation, and capital acquisition. To unlock global funding, the community must move beyond pure science and leverage mainstream media, inspiring public relations campaigns, and compelling storytelling to normalize the conversation and secure public and political backing.
2. Hybrid funding and democratised investment. The session highlighted the need to tap into vast global capital pools through diverse mechanisms. Rather than relying solely on traditional venture capital or government grants, the roadmap advocates for hybrid models. These include philanthropic funds, public-private multinational consortia, and even non-profit crowdfunding platforms to democratize early-stage investment and generate momentum.
3. Leveraging big data and AI for commercial viability. To reduce the immense costs of space biomedical research, the group emphasized integrating big data analytics, artificial intelligence, and advanced sensor technologies. Drawing on terrestrial disciplines like neonatology, leveraging these tech-driven efficiencies can accelerate R&D and generate lucrative, near-term commercial spin-offs for healthcare on Earth.
4. Equitable IP and geopolitical stability. The structure must balance the need for commercial incentives, which are essential to attract large-scale private investment, with broader humanitarian aims. A key strategic milestone is establishing an intellectual property framework that prevents the monopolisation of foundational reproductive technologies, ensuring they remain accessible as a global public good and preventing geopolitical friction.

Immediate action. Develop a coordinated global communications strategy to build public consensus and awareness, while simultaneously exploring the formation of a non-profit foundation or hybrid entity to channel initial philanthropic and crowdfunded investments into foundational big data and biological research.

Estimates. Plenary discussions indicated that timelines for executing the complete roadmap may range from 10 to 50 years, with associated budget requirements estimated between $500 million and $5 billion. These preliminary figures are expected to be progressively refined as subsequent symposia and iterative feedback loops provide more detailed and informed input.

07

Expected Impact of the Roadmap and Next Steps

7.1 Expected impact

Implementing this roadmap will transition the study of human reproduction in space from an isolated, fragmented curiosity into a coordinated, globally recognised scientific and operational priority. By unifying academia, commercial industry, and regulatory agencies under a shared framework, this roadmap is expected to systematically de-risk future multiplanetary expansion and establish robust bioethical and legal governance. Furthermore, addressing the extreme challenges of off-world reproduction will accelerate terrestrial medical spin-offs, such as advanced, automated IVF technologies and novel diagnostics, providing direct benefits to reproductive healthcare and accessibility on Earth.

7.2 Strategic next steps for implementation and evolution

To actively refine, update, and implement this roadmap, the following immediate and near-term milestones have been established:

1. Publish and disseminate Version 1.0 (Governance & Outreach), Formalise the publication of this initial roadmap in open-access scientific repositories (e.g., Zenodo). This open-science approach will invite public commentary, peer validation, and critical feedback from the wider scientific and spacefaring communities.
2. Expand the global consortium (Community Engagement), Actively broaden the membership of the Space Reproduction Roadmap Consortium (SRRC). This includes targeted outreach to stakeholders from currently non-spacefaring nations, diverse cultural groups, and terrestrial regulatory bodies (e.g., WHO, national fertility regulators) to ensure the roadmap remains culturally inclusive and legally sound.
3. Prioritise foundational data generation (Scientific Content), Execute the immediate biomedical and technological priorities by accelerating the funding and development of Microphysiological Systems (MPS) and automated "on-a-chip" tools. Gathering baseline data on early cellular cleavage in microgravity is the critical first step to building the scientific credibility needed to advance to subsequent roadmap phases.
4. Draft a unified Space Bioethics Code of Conduct (Legal & Content), Convene a specialised interdisciplinary working group to draft an international ethical framework. This document will aim to bridge the gap between rapid commercial innovation and traditional governmental oversight, mitigating the risks of jurisdictional ambiguity in off-world research.
5. Launch a strategic communications and funding campaign (Management & Business), Develop a compelling global narrative and media strategy to normalise the conversation around off-world reproduction. This storytelling approach will be leveraged to attract hybrid investment models, combining private venture capital with philanthropic funds and democratised crowdfunding.
6. Institutionalise iterative symposia (Evolution & Roadmap Management), Commit to a regular cycle of international symposia (e.g., annual or biennial). These subsequent gatherings will serve to integrate new empirical data, review technological breakthroughs, and progressively expand the roadmap's scope beyond early embryonic development to encompass the full "germline-to-grave" life-cycle.

"For the first time in history, humanity possesses the technological agility, commercial momentum, and scientific tools necessary to ethically and systematically address the fundamental question of our ability to reproduce beyond Earth."

Conclusion

The transition toward a multiplanetary species is no longer an abstract concept, and relying on fragmented research or delayed regulatory engagement is no longer sufficient. By adopting this community-led roadmap, strategically integrating foundational in vitro data generation, robust mammalian proxies, and advanced Microphysiological Systems, we can establish a comprehensive and actionable research framework. This collaborative, interdisciplinary approach is essential not only to safeguard the health of future spacefarers and cultivate societal readiness but also to drive profound innovations in human development that will yield direct, lasting benefits for healthcare on Earth.