I still remember the first time I watched a plant grow in a clinostat. It was a messy, spiraling affair—roots searching for gravity that wasn’t there, shoots bending in confusion. A colleague walked by, glanced at the setup, and asked the question I’ve now heard a hundred times: “But how does this help us get to Mars?” It’s a fair question, and one that deserves a better answer than the knee-jerk defensiveness it often provokes in researchers. The problem isn’t the question itself. The problem is the assumption behind it: that science must justify itself through immediate, practical application to be worthwhile.
In space medicine and translational biology, this assumption is particularly loud. We are, after all, in the business of keeping humans alive in the most hostile environment imaginable. Every experiment, every grant proposal, every published paper seems to require a direct line of sight to a countermeasure, a drug, or a protocol. But some of the most transformative breakthroughs in our field—and in medicine as a whole—emerged not from targeted problem-solving, but from someone simply wondering, “What happens if…?”
This article is a defense of that wondering. It’s an exploration of why curiosity-driven research, the kind that doesn’t have an obvious return on investment, is not a luxury in space medicine. It’s the engine that keeps the entire enterprise from stalling.
The Serendipity of the Vestibular System
Consider the humble otolith—the tiny calcium carbonate crystal in our inner ear that tells our brain which way is down. When the first astronauts returned from orbit, space medicine was squarely focused on the cardiovascular system. Orthostatic intolerance, the inability to stand without fainting upon return to Earth, was the pressing problem. Researchers built centrifuges, designed fluid-loading protocols, and tested compression garments. The work was practical, targeted, and essential.
But a handful of physiologists were more interested in a quirky, seemingly low-priority observation: astronauts couldn’t tell which way was up. Their spatial orientation was scrambled. They reported illusions of flipping over when they closed their eyes. These weren’t mission-critical problems—astronauts could still operate switches and navigate modules—so the findings were initially treated as curiosities, footnotes in debrief reports.
Yet it was this curiosity-driven line of inquiry into vestibular adaptation that eventually unlocked a deeper understanding of neuroplasticity in microgravity. Researchers discovered that the brain doesn’t just reinterpret signals from the otoliths; it fundamentally rewires the integration of visual, proprioceptive, and vestibular inputs. This rewiring, it turns out, has profound implications for how astronauts re-adapt to gravity—not just for balance, but for cardiovascular control, motor coordination, and even cognitive performance. The practical applications arrived, but they arrived because someone followed a question without knowing where it led.
The Translational Paradox
Translational research—the process of turning basic science into clinical interventions—is often depicted as a linear pipeline. Bench to bedside. Lab to launchpad. But in my experience, the most impactful translations are rarely linear. They’re more like a braided river, with channels splitting and rejoining, fed by unexpected tributaries.
Take the example of fluid shifts. We’ve known since the earliest missions that microgravity causes a headward shift of fluids, leading to puffy faces and nasal congestion. The practical response was straightforward: design lower-body negative pressure devices to pull fluids back toward the feet. Problem identified, solution engineered. But some researchers kept asking more fundamental questions: What does this fluid shift do to the brain? To the eye? To the lymphatic system?
Those questions led to the discovery of Spaceflight-Associated Neuro-ocular Syndrome (SANS), a condition that now ranks among the highest-priority risks for a Mars mission. The initial fluid-shift research was practical and targeted. But the deeper understanding—the kind that might actually prevent vision loss on a three-year mission—came from scientists who were simply curious about what happens to the back of the eye when gravity is removed. They weren’t solving a known problem. They were looking for one.
When the Model Organism Talks Back
One of the most humbling aspects of space biology is how often our model systems surprise us. We send experiments to the International Space Station with clear hypotheses, and the organisms on board—cells, plants, animals—do something we never predicted. A gene we thought would be upregulated is silenced. A bone we expected to weaken shows signs of remodeling. A bacterium becomes more virulent for reasons that don’t fit our models.
These surprises are often treated as experimental noise or failures. But they’re actually gifts. They’re the organism telling us that our understanding is incomplete. In my own work with endothelial cells, I’ve seen cytoskeletal rearrangements in microgravity that simply don’t occur in any ground-based analog. We weren’t looking for them. They didn’t fit the hypothesis. But they opened a window into mechanotransduction pathways that we’re still exploring years later.
This is where the tension between curiosity-driven and application-driven research becomes most acute. A grant proposal that says “we will study whatever the cells do” is unlikely to get funded. But a proposal that says “we will test this specific countermeasure” might miss the most important finding entirely. The art of space biology lies in designing experiments that are rigorous enough to be interpretable, but flexible enough to capture the unexpected.
Building the Knowledge Scaffold
Think of scientific knowledge not as a ladder climbing toward a specific goal, but as a scaffold. Each study adds a plank, a joint, a support. Some planks are placed with a clear purpose—they’re part of the countermeasure development platform. Others seem to lead nowhere, extending outward into empty space. But as the scaffold grows, connections emerge. A plank that seemed useless suddenly provides the perfect anchor for a new structure. A joint that was placed out of curiosity becomes the critical link between two previously separate fields.
This is how we’ve built our understanding of bone loss in space. Early studies simply documented the phenomenon. Later work explored mechanisms—osteoclast activation, osteoblast suppression, changes in calcium metabolism. Some of this research had clear translational goals; much of it was driven by basic scientific curiosity. Today, we’re developing countermeasures that combine exercise, nutrition, and pharmacological interventions. But we couldn’t have designed those countermeasures without the decades of foundational research that came before, much of which had no obvious application at the time.
The scaffold metaphor also helps explain why we can’t just skip to the “useful” parts. You can’t build the top of a scaffold without the bottom. And you often don’t know which parts of the bottom will be load-bearing until you start building upward.
The Earthly Echoes of Space Curiosity
One of the most compelling arguments for curiosity-driven space medicine research is how often it yields unexpected benefits for terrestrial health. The same bone-loss studies that seemed esoteric in the 1970s now inform our understanding of osteoporosis. Research on orthostatic intolerance in astronauts has improved care for patients with postural orthostatic tachycardia syndrome (POTS). Studies of muscle atrophy in microgravity have illuminated pathways relevant to sarcopenia, spinal cord injury, and prolonged bed rest.
These weren’t the intended outcomes. They were echoes—ripples that spread outward from a stone thrown into a pond. The researchers who threw those stones weren’t aiming at clinical applications on Earth. They were simply curious about what happens to the human body when gravity is removed. The applications followed.
The Risk of Requiring Relevance
When funding agencies, review panels, or the public demand that every experiment have a clear, immediate application, we create a system that selects for incrementalism. Safe proposals. Predictable results. The kind of science that confirms what we already suspect rather than challenging our assumptions.
This is particularly dangerous in space medicine, where our knowledge base is still thin. We’ve had only about 600 people travel to space. Our understanding of long-duration spaceflight physiology is based on a handful of subjects, mostly on missions of six months or less. We are, in many ways, still in the natural-history phase of space medicine—the phase where careful observation and description are the most valuable activities. Demanding that every observation come with a built-in application is like asking 19th-century naturalists to justify their expeditions by promising new pharmaceuticals. The pharmaceuticals came, but they came decades later, and they came from the basic knowledge those naturalists accumulated.
I’m not arguing against translational research. I’m arguing against only translational research. The two modes of inquiry are complementary, not competing. But when resources are scarce, curiosity-driven research is often the first to be cut, because its benefits are harder to quantify in a grant proposal or a congressional briefing.
What We Lose When We Lose Curiosity
There’s a subtler cost to the relentless focus on immediate utility: we risk losing the kind of scientists who are drawn to questions rather than answers. The best researchers I know are driven by a deep, almost visceral need to understand. They’re the ones who stay up late analyzing data not because a deadline is looming, but because they can’t stand not knowing what the results will show. They’re the ones who follow unexpected findings down rabbit holes, who read outside their field, who ask the questions that don’t appear in any strategic roadmap.
If we create a system where only immediately useful research is valued, we drive these people out. We tell them, implicitly, that their kind of thinking isn’t welcome. And we lose the very engine of discovery that has driven our field forward.
Space medicine needs both the engineers and the explorers. The engineers design the countermeasures, optimize the protocols, and solve the known problems. The explorers—the curiosity-driven researchers—find the problems we didn’t know we had. Both are essential. Neither can do the other’s job.
Practical Steps for a Balanced Portfolio
So how do we, as a community, protect and nurture curiosity-driven research while still meeting the urgent needs of space exploration? Here are a few thoughts, drawn from my own experience and from conversations with colleagues across the field.
Design Experiments with Built-in Exploratory Aims
When writing a grant or planning a study, include a specific aim that is explicitly exploratory. This isn’t a weakness—it’s intellectual honesty. Acknowledge that you’re going to collect data you don’t fully know how to interpret, and that this is a feature, not a bug. Some of the most successful space biology experiments, like the NASA Twins Study, were designed with this flexibility in mind.
Fund People, Not Just Projects
Project-based funding is efficient for solving defined problems. But it’s terrible for cultivating the kind of long-term, curiosity-driven research programs that yield unexpected insights. Fellowship programs, unrestricted research grants, and institutional support for investigator-initiated studies are essential. They give researchers the freedom to follow their questions wherever they lead.
Create Space for Serendipity in Mission Planning
On the International Space Station, crew time is the most precious resource. Every minute is scheduled, every experiment justified. But some of the most valuable physiological data has come from unplanned observations—astronauts noticing changes in their own bodies and reporting them. We should build in structured opportunities for this kind of serendipitous discovery, even on highly constrained missions.
Value Negative Results
In a field driven by the need for countermeasures, a study that shows an intervention doesn’t work can feel like a failure. But knowing what doesn’t work is just as important as knowing what does. We need to create publication venues, funding mechanisms, and cultural norms that reward rigorous negative results. Otherwise, we’ll keep repeating the same studies and wondering why we’re not making progress.
Frequently Asked Questions
Why should taxpayers fund research that doesn’t have an obvious benefit?
Because the history of science shows that the most transformative discoveries often come from research that had no obvious application at the time. The basic research that led to GPS, to medical imaging, to countless pharmaceuticals—none of it was undertaken with those outcomes in mind. When we fund curiosity-driven research, we’re investing in a future we can’t yet see. In space medicine specifically, we’re still in the early stages of understanding how the human body responds to the space environment. Prematurely narrowing our focus to only applied questions would blind us to the very phenomena we need to understand to keep astronauts safe on long-duration missions.
How do we balance curiosity-driven research with the urgent need for countermeasures?
This isn’t an either-or proposition. The most effective research programs maintain a portfolio approach: some resources dedicated to immediate, applied problems; some dedicated to foundational, curiosity-driven questions. The key is to recognize that these two modes of research feed each other. Applied problems often reveal fundamental knowledge gaps that only basic research can fill. And basic research often uncovers mechanisms that become the basis for new countermeasures. The balance will shift depending on the maturity of the field and the proximity of mission deadlines, but both modes should always be present.
What can early-career researchers do to pursue curiosity-driven questions in a funding environment that favors applied research?
First, look for funding mechanisms that explicitly support basic research, such as the NASA Space Biology Program or the European Space Agency’s Continuously Open Research Announcements. Second, frame your curiosity-driven questions in terms of the knowledge gaps they address, even if you can’t predict the applications. Third, build collaborations with applied researchers—your fundamental insights may be exactly what they need to solve a practical problem. Finally, be your own best advocate. Write clearly about why your question matters, even if the answer doesn’t come with a ready-made countermeasure. The ability to articulate the value of basic research is a skill worth cultivating.
Looking Ahead
As we set our sights on the Moon and Mars, the pressure to deliver practical solutions will only intensify. Astronauts on a Mars mission won’t have the luxury of waiting for us to figure out the basic biology. They’ll need countermeasures that work, and they’ll need them soon.
But here’s the paradox: the more urgent the need, the more we need curiosity-driven research. Because the problems we’ll face on a Mars mission aren’t the ones we’ve already identified. They’re the ones we haven’t thought of yet. The ones that will emerge from the complex interplay of radiation, isolation, altered gravity, and closed-environment microbiology over a timescale we’ve never studied. The only way to prepare for unknown problems is to build the deepest possible understanding of the underlying biology. And that understanding comes from curiosity.
So the next time someone asks me, “But how does this help us get to Mars?” I’ll have a better answer. I’ll say: “I don’t know yet. That’s why I’m doing it.”