Moon vs. Mars vs. asteroids: where to mine first
A side-by-side comparison of the three frontiers on distance, feedstock, demonstrated hardware and who's paying. Our pick, with reasons.
Every space resources pitch picks a frontier, and each one has a different failure mode. Here’s how the three compare on the questions that decide whether a business exists.
| Moon | Mars | Near-Earth asteroids | |
|---|---|---|---|
| One-way travel | Days | Months, with launch windows roughly every two years | Months to years, rare windows |
| Main feedstock | Polar ice, regolith oxides, solar-wind gases | Atmospheric CO2, subsurface ice | Hydrated clays, metals |
| Demonstrated on site | Ice detected from orbit and impact; no extraction yet | MOXIE: 122 g of oxygen | 121.6 g of Bennu returned for lab study |
| Nearest paying customer | NASA Moon Base, helium-3 buyers | A crewed Mars program | A cislunar propellant market that doesn’t exist yet |
The Moon wins on time and on customers. A trip measured in days means a broken machine can be replaced within a launch cycle, and an anchor buyer is already spending money: NASA’s Moon Base effort, covered in our south pole series, plus the helium-3 offtake contracts we tallied in our helium-3 reality check. The first commercial payload built specifically to measure and extract lunar resources, Interlune’s Prospect Moon, is aiming for 2028.
Mars wins on chemistry. It has carbon, which the Moon barely does, and an atmosphere you can process without digging, as MOXIE showed. If SpaceX’s Mars ambitions become a funded cargo program, Mars propellant production gets a customer overnight, and that customer is the company with the rockets. That’s an unusual market: one buyer who is also the shipper.
Asteroids win on gravity and lose on everything involving calendars. Landing and leaving is cheap in energy, but launch windows are sparse and missions are long. The proof so far is laboratory-scale: 121.6 grams of Bennu, returned for science.
Our pick is the Moon first, by a wide margin, then Mars if and only if SpaceX’s cargo flights start, with asteroids as a follow-on once there’s a propellant buyer in cislunar space. Mars’s chemistry advantage is real but it doesn’t pay salaries until someone lands there.
What would change our mind: a firm, funded SpaceX Mars cargo manifest that includes ISRU hardware. That would make Mars the better bet for anyone selling propellant equipment.
Not affiliated with NASA, SpaceX or any agency or company mentioned. Not investment advice. Disclaimer.