Humanity’s most efficient path to Mars includes a pit stop near the moon, a new study suggests. Mars-bound crewed spacecraft should launch with just enough fuel to get to filling stations near the moon, and these stations would then dispense propellant derived from lunar water-ice, according to the study.
Such a strategy would reduce the mass of a Mars mission by up to 68 per cent at launch, resulting in significant cost savings, researchers said.
“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,” study co-author Olivier de Weck, a professor of aeronautics and astronautics and of engineering systems at the Massachusetts Institute of Technology (MIT), said.
“The idea of taking a detour into the lunar system… it’s very unintuitive,” de Weck added.
“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.”
Permanently shadowed craters near the moon's poles are thought to harbor large quantities of water ice. This ice can be processed into hydrogen and oxygen molecules — the chief components of rocket fuel, which could then be used to fill up the tanks. Exploiting lunar resources in this way could reduce the cost of spaceflight, helping open up the solar system to human exploration, moon-mining advocates say.
The new study, which was published recently in the Journal of Spacecraft and Rockets, comes to the same basic conclusion.
The researchers — led by Takuto Ishimatsu, now a postdoc at MIT — developed mathematical models to determine the most efficient ways to get humans to Mars. The scientists found that the best option relies on “gas stations” positioned at gravitationally stable places in the Earth-moon system called Lagrange points.
Source: www.news.discovery.com
