It’s the question every space enthusiast has yelled at their TV, their phone, or their bemused dinner guests: “We landed on the Moon in 1969. It’s been over 50 years. Where is our Mars colony?”
By rights, we should be there. We have rovers crawling over Martian rocks, helicopters buzzing through its thin air, and orbital cameras mapping every canyon. We’ve even made oxygen from Martian atmosphere (thanks, MOXIE). So why are the only footprints on another world still those of Apollo astronauts? Why not Mars?
The answer isn't a single problem. It's a perfect storm of physics, biology, money, and courage. Here’s why Mars remains the planet of the future—and probably will for at least another decade.
Distance: The Cruelest Factor
The Moon is three days away. Mars is, at minimum, seven months away—and that’s only when the planets align perfectly (every 26 months). Most of the time, it’s a nine-month or longer journey.
That doesn’t sound impossible until you realize: a Mars mission isn't a sprint. It’s a three-year round trip (including time on the surface waiting for the planets to realign for return). Three years in a tin can. Three years of radiation, isolation, and mechanical failure risk.
The Moon mission had a 0.01% chance of catastrophic failure per day. A Mars mission, simply by lasting 100 times longer, multiplies those risks even before you add new hazards.
The Radiation Wall
Between Earth and Mars lies a vast region of deep space with no protective magnetic field. Galactic cosmic rays—high-energy particles from exploded stars—pass through matter like ghosts. They shred DNA, increase cancer risk, and may cause cognitive damage.
On the Moon, you’re exposed for a week. On Mars, you’re exposed for months in transit and on the surface (Mars has no global magnetic field and only a flimsy atmosphere). Total mission radiation dose: roughly equivalent to getting a full-body CT scan every week for three years.
We have no proven shielding lightweight enough for a spacecraft. Water works well, but water is heavy. Lead works, but lead is also heavy. Every pound of shielding is a pound less of fuel or food.
Landing Is a Nightmare
Mars has an atmosphere. This is good for aerobraking, but terrible for landing. The atmosphere is just thick enough to heat things up (enter the 2,000°C fireball) but too thin for parachutes alone to slow a heavy human lander.
The results? We’ve lost about half of all landing attempts on Mars—rovers the size of cars. A human lander would be the size of a two-story house. NASA’s current solution (the Sky Crane, which lowered the Curiosity and Perseverance rovers) works for one-ton robots. It doesn't scale easily to 20-ton human habitats.
And that’s just getting down. Getting off Mars requires a rocket powerful enough to escape its gravity (about 38% of Earth’s), which means bringing fuel—or making it on the surface. We haven’t yet proven fuel production at scale.
The Human Body Is the Weakest Link
We already know what space does to the human body (see the previous blog posts!). But on Mars, the damage accelerates and compounds:
Bone loss: After eight months in zero gravity, astronauts would arrive with bones already weakened. On Mars, even at 38% gravity, they’d struggle to walk and risk fractures.
Eye damage: SANS (the vision syndrome) could leave crew members partially blind on the surface.
Radiation sickness: Long-term exposure increases cancer risk by several percentage points—a trade some astronauts might accept, but ethicists debate.
Crew psychology: Three years in a small group, with 20-minute communication delays to Earth (no real-time conversations), no rescue possible, and no privacy. That’s a recipe for conflict, depression, or worse.
We’ve never sent humans beyond low Earth orbit for more than a few weeks. Mars is a leap of orders of magnitude, not just miles.
The Rocket Equation Is Ruthless
To get to Mars, you need to launch everything from Earth: the ship, the fuel, the food, the water, the habitat, the return vehicle. The more mass you take, the more fuel you need. The more fuel you need, the more mass you take. It’s a vicious cycle.
The Apollo Saturn V was a 111-meter-tall monster. A Mars mission would require a rocket two to three times larger, or multiple launches with orbital assembly (which we’ve never done for human crews). SpaceX’s Starship is promising, but it hasn't yet reached orbit, let alone landed humans anywhere.
We’ve Been Here Before (And Failed)
Remember the 1990s? NASA promised “Mars by 2010.” Then “Mars by 2030.” Then “Mars by the 2030s.” The problem isn't just technology—it's political will. Presidential administrations change. Congress appropriates funds in fits and starts. The Moon landing succeeded because of Cold War urgency. Mars has no equivalent driver.
Private companies like SpaceX have reignited the dream, but they face the same physics. And even if a billionaire-funded mission launches, the question remains: who decides the rules? Who provides rescue? Who handles the inevitable death of a crew member?
We don't have a legal or ethical framework for a Mars mission. That’s not an engineering problem. It’s a human problem—and in some ways, it’s the hardest one.
The Silent Showstopper: Dust
This one sounds almost silly, but it’s terrifying. Martian dust is fine, static-charged, and slightly toxic (perchlorates). It gets into everything. Apollo astronauts on the Moon (with similar dust) had spacesuit joints seize up, visors scratched opaque, and dust inside the lunar module causing "lunar hay fever."
On Mars, with a six-month surface stay, dust storms (while not physically destructive like in The Martian) can block sunlight for solar panels and coat every seal, bearing, and hinge. We have no proven countermeasure for long-term dust mitigation.
So When Will We Actually Go?
Realistically? Not before 2035 at the absolute earliest, and more likely the 2040s. That’s if everything goes perfectly: if Starship or SLS or a Chinese rocket proves reliable, if radiation solutions emerge, if funding holds, if nobody changes priorities.
But here’s the hopeful part: every obstacle listed above is an engineering problem. None violates the laws of physics. We can solve them. It’s just harder than we imagined in 1969, harder than sci-fi movies admit, and harder than our impatient hearts want to accept.
Mars is waiting. It’s not going anywhere. And when we finally get there—when the first human boot presses into that red rust—the wait will have been worth it.
Until then, we keep building, testing, failing, and learning. Because that’s what explorers do.
