Space · 6 min read
Could we actually live on Mars?
Not whether a rocket can get there — whether a person can stay.
The problem is not the journey
Getting to Mars is an engineering problem with known answers. Staying is a biology problem with open ones. The surface receives no magnetic shielding, the atmosphere is about one percent as dense as ours, and the closest resupply is months away at best.
0.38g
Martian surface gravity, relative to Earth
Radiation is the hard limit
Astronauts on a round trip would accumulate a dose far beyond what any current occupational limit allows. The most realistic answers are unglamorous: thick regolith over the habitat, water walls, and time spent underground.
We know how to land on Mars. We do not yet know how to grow old there.
What a first settlement probably looks like
Less a city than a laboratory: a handful of buried modules, a small nuclear source, greenhouses that fail and get rebuilt, and crews rotating out every two years. Permanence comes later, if it comes at all.
