Canadian astronaut David Saint-Jacques has long argued that space exploration is not a diversion from addressing terrestrial challenges, but a catalyst for solving them. As debates swirl over billionaires funding private missions beyond Earth, he emphasizes that the technologies developed for deep-space travel often have transformative applications at home. “You can argue whether or not we need to go to Mars. I think that’s not the point. We will go to Mars because it’s there and we want to explore,” he said. “But going to Mars is going to require figuring out recycling. We’re going to become masters at air, water and recycling, at food production. That’s going to help us on Earth.”
Saint-Jacques, a physician and former family doctor in the Inuit community of Puvirnituq, Nunavik, believes that while society must prioritize essentials like health care, education, and security, it should also reserve resources for ambitious pursuits in science, exploration, and the arts. “That is how we progress,” he noted. “If we just do what’s needed, we don’t progress. We don’t change. The only way we move forward is by doing a little bit of crazy, blue-sky dreaming.”
His own career illustrates this philosophy. During his 204-day mission aboard the International Space Station from 2018 to 2019, Saint-Jacques tested the Bio-Monitor, a Canadian-developed smart shirt system that continuously tracked vital signs including heart rate, breathing, blood pressure, temperature, physical activity, and blood oxygen levels. This wearable technology, designed for the rigors of space, holds promise for remote health care on Earth. By replacing cumbersome cables and sensors with a comfortable garment, it could enable unobtrusive, round-the-clock monitoring of patients in isolated communities.
Saint-Jacques envisions its utility for individuals with chronic conditions in places far from advanced medical facilities. “Imagine an elderly person living in a little village with, for example, a chronic lung disease,” he said. “If there was that simple and unobtrusive way to just gently monitor their general health status, the nurse in the village could get an alarm [if] there’s something … before it’s too late.”
The potential extends to intensive care units, where continuous, non-invasive monitoring could improve patient outcomes. Dr. Farhan Asrar, a family physician and co-author with Saint-Jacques of a Nature Medicine article, points out that this is only one example of space-derived innovation benefiting everyday life. “If you went from point A to point B using GPS, that was thanks to space technology,” Asrar said. He stresses the importance of public awareness about such connections.
Satellite imaging offers another avenue for cross-domain impact. By mapping vaccine distribution strategies, tracking weather patterns, and monitoring migration routes, these tools can help predict and contain infectious disease outbreaks. The history of space technology is rich with similar spin-offs: the Apollo program’s need for compact computers accelerated the digital revolution; radiation exposure studies for astronauts informed safety protocols in cancer treatment facilities; and microgravity research continues to advance understanding of osteoporosis and other degenerative bone diseases.
Saint-Jacques and Asrar also acknowledge the role of private industry in pushing boundaries. Reusable rockets, pioneered by commercial ventures, represent a leap in cost efficiency that would have been prohibitive for government agencies alone. The commercialization of spaceflight, they note, is now an established reality.
For Saint-Jacques, the view from orbit underscores the urgency of such innovation. “When you see the Earth from space, two things are amazing: First, how beautiful she is — the thin blue line of the atmosphere that’s merely a little fog clinging onto the planet, keeping us alive.” Yet beyond that beauty lies the stark reality of isolation. “This is the true human condition, how exposed we are in the cosmos. Our home is really our only raft, our only oasis.”
He welcomes the fact that influential figures are now experiencing this perspective firsthand, recognizing both the fragility and the resilience of the planet that sustains all human life.