To save on weight, a detour to the moon is the best route to Mars

For a piloted mission to Mars, fueling up on the moon could streamline cargo by 68 percent.

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Launching humans to Mars may not require a full tank of gas: A new MIT study suggests that a Martian mission may lighten its launch load considerably by refueling on the moon.

Previous studies have suggested that lunar soil and water ice in certain craters of the moon may be mined and converted to fuel. Assuming that such technologies are established at the time of a mission to Mars, the MIT group has found that taking a detour to the moon to refuel would reduce the mass of a mission upon launch by 68 percent.

The group developed a model to determine the best route to Mars, assuming the availability of resources and fuel-generating infrastructure on the moon. Based on their calculations, they determined the optimal route to Mars, in order to minimize the mass that would have to be launched from Earth — often a major cost driver in space exploration missions.

They found the most mass-efficient path involves launching a crew from Earth with just enough fuel to get into orbit around the Earth. A fuel-producing plant on the surface of the moon would then launch tankers of fuel into space, where they would enter gravitational orbit. The tankers would eventually be picked up by the Mars-bound crew, which would then head to a nearby fueling station to gas up before ultimately heading to Mars.

Olivier de Weck, a professor of aeronautics and astronautics and of engineering systems at MIT, says the plan deviates from NASA’s more direct “carry-along” route.

“This is completely against the established common wisdom of how to go to Mars, which is a straight shot to Mars, carry everything with you,” de Weck says. “The idea of taking a detour into the lunar system … it’s very unintuitive. But from an optimal network and big-picture view, this could be very affordable in the long term, because you don’t have to ship everything from Earth.”

The results, which are based on the PhD thesis of Takuto Ishimatsu, now a postdoc at MIT, are published in the Journal of Spacecraft and Rockets.

A faraway strategy

In the past, space exploration programs have adopted two main strategies in supplying mission crews with resources: a carry-along approach, where all vehicles and resources travel with the crew at all times — as on the Apollo missions to the moon — and a “resupply strategy,” in which resources are replenished regularly, such as by spaceflights to the International Space Station.

However, as humans explore beyond Earth’s orbit, such strategies may not be sustainable, as de Weck and Ishimatsu write: “As budgets are constrained and destinations are far away from home, a well-planned logistics strategy becomes imperative.”

The team proposes that missions to Mars and other distant destinations may benefit from a supply strategy that hinges on “in-situ resource utilization” — the idea that resources such as fuel, and provisions such as water and oxygen, may be produced and collected along the route of space exploration. Materials produced in space would replace those that would otherwise be transported from Earth.

For example, water ice — which could potentially be mined and processed into rocket fuel — has been found on both Mars and the moon.

“There’s a pretty high degree of confidence that these resources are available,” de Weck says. “Assuming you can extract these resources, what do you do with it? Almost nobody has looked at that question.”

Building a network in space

To see whether fuel resources and infrastructure in space would benefit manned missions to Mars, Ishimatsu developed a network flow model to explore various routes to Mars — ranging from a direct carry-along flight to a series of refueling pit stops along the way. The objective of the model was to minimize the mass that would be launched from Earth, even when including the mass of a fuel-producing plant, and spares that would need to be pre-deployed.

The approach models the movement of cargo and commodities, such as fuel, in a supply chain network in space. Ishimatsu developed a new mathematical model that improves on a conventional model for routing vehicles. He adapted the model for the more complex scenario of long-term missions in space — taking into account constraints specific to space travel.

The model assumes a future scenario in which fuel can be processed on, and transported from, the moon to rendezvous points in space. Likewise, the model assumes that fuel depots can be located at certain gravitationally bound locations in space, called Lagrange points. Given a mission objective, such as a set of weight restrictions, the model identifies the best route in the supply network, while also satisfying the constraints of basic physics.

Ishimatsu says the research demonstrates the importance of establishing a resource-producing infrastructure in space. He emphasizes that such infrastructure may not be necessary for a first trip to Mars. But a resource network in space would enable humans to make the journey repeatedly in a sustainable way.

“Our ultimate goal is to colonize Mars and to establish a permanent, self-sustainable human presence there,” Ishimatsu says. “However, equally importantly, I believe that we need to ‘pave a road’ in space so that we can travel between planetary bodies in an affordable way.”

“The optimization suggests that the moon could play a major role in getting us to Mars repeatedly and sustainably,” de Weck adds. “People have hinted at that before, but we think this is the first definitive paper that shows mathematically why that’s the right answer.”

William Gerstenmaier, associate administrator for human exploration and operations at NASA, says understanding what resources may be available, both along the way to Mars and once there, is “essential to sustainable human presence beyond low-Earth orbit.”

“The paper shows clearly that leveraging water and other valuable in-space resources will lower the cost for human exploration of the solar system,” says Gerstenmaier, who was not involved in the research.. “NASA had previously planned on using Mars resources to reduce propellant needs at Mars. This study, along with others, is showing the potential advantages of using lunar resources as well.”

Topics: Mars, Research, Space exploration, space, astronomy, and planetary science, NASA, Technology and society, School of Engineering, IDSS, Engineering Systems, Aeronautical and astronautical engineering


Color me skeptical, lol.

I'm skeptical as well. If we were inhabitants of Venus and wanted to stop and get water from somewhere on our way to Mars, we'd be figuring out how to stop on Earth to get it. It also seems unlikely that the development costs of a lunar lander, lunar water extractor, lunar launcher, and transfer vehicle would be less than adding an Earth based tanker module and the extra SLS launch. Of course the second paragraph notes that they assumed the infrastructure already exists. Hmmm.

why use the water as a fuel when the water could be used to establish a permanent lunar presence?

And what about asteroid mining. Engaged entities are planning fuel depots in space as well. Perhaps it would be even more economical than lunar mining..., and work is already in progress.

What about cost of equipment, landing that equipment on the moon and manning the facility?

Im not from US but I guess it would go a long way to sent an automated test platform/rover onto the moon to try how effective this would be.

What kind of fuel? We're not talking about chemical rockets, are we? I thought it was long established that nuclear rockets were preferred for a trip to Mars, as they could greatly reduce the transit time. We developed nuclear rockets in the 1960s. Isn't this what they were made for?

Pfffft. Go nuclear (propulsion) or stay home.

I never imagined you would launch the whole Mars caboodle in one go from Earth. At the very least I thought it would be a modular approach with several launches, bolted together in space-dock.

OK, and where is that paper? Who are the authors, De Weck and Ishimatsu? I'd like to read and discuss that paper instead of the press release.

It's too bad we don't have a president which would do something good for space exploration like devoting NASA's efforts to building a permanent base on the moon.

I believe that space development will be driven by two factors: resources and delta-v. The Moon is the largest gravity well that can be quickly exploited and return value. It's closer, safer and visible, with much lower capital requirements.That's why Mars is a dead end, short of 20-50 years of space infrastructure development. Mars will have to wait until the "low fruit" of Space is harvested (NEOs, Lunar S Pole) and developed (Lagrange point, LEO & HEEO resource depots). Unfortunately (for Mars), once mankind has developed a space infrastructure, we may forget the reason why we wanted to go back down any gravity well. Except, perhaps, the Sun's - I think Mercury's S Pole will be developed before Mars.
Ask yourself this question - what will be produced on Mars and sold for a profit, on Earth?

This is a lot like the military, you need a forward operating base, and a rear operating base for supply missions, but to sustain, protect, and govern the people, ie: rules, laws, people, and finances, you almost need to set up a new international government of space, that taxes the people who work there and the companies that operate there. This in turn will help keep things operating more smoothly and keep things less costly overall.

We'r waiting for that if does so happen

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