Image: ESA
ABSTRACT breaks down mind-bending scientific research, future tech, new discoveries, and major breakthroughs.
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“The nature of lunar dust can be a drawback for lunar exploration,” said Juan‑Carlos Ginés‑Palomares, a lead author of the study and an assistant researcher at the Technical University of Berlin, in an email to Motherboard. “Many particles have sharp edges (due to the absence of erosion agents on the Moon, like wind or water) and are generally electrically charged (which makes it especially ‘sticky'). It can cause damage to lunar landers, spacesuits, and human lungs if inhaled.”
“We wanted to contribute to overcome the problems linked to lunar dust,” he noted. “Manufacturing roads is a way to avoid the formation of dust clouds while facilitating the movement of vehicles and rovers.”
Of course, paving roads on the lunar surface is easier said than done. Given the extremely high cost of spaceflight, it is not feasible for mission planners to just load up a spacecraft with heavy bricks to lay on the Moon. Instead, researchers have to come up with creative ways to utilize materials that are already available on the lunar surface.
To that end, ESA launched the PAVER project to develop some of these so-called “in situ resource utilization (ISRU)” technologies with materials here on Earth. The collaboration involved scientists from the Technical University of Clausthal, Germany’s Federal Institute for Materials Research and Testing (BAM), the Liquifer Systems Group in Austria, and Aalen University, which is where Ginés‑Palomares was based during this research.
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Together, the researchers pioneered a technique for melting EAC-1A, a lunar simulant developed by ESA, using a carbon dioxide laser that mimicked the effects of focused solar radiation. Through trial-and-error, they were able to produce robust triangular tiles measuring about ten inches across and about a half-inch wide.
The team concluded that the blocks could be neatly packed together to make critical infrastructure on the Moon. Ginés‑Palomares said it was difficult to predict when this technique might actually be tested on the lunar surface, given all the variables surrounding the funding, organization, and priorities of space missions. However, he estimated that it could be technically feasible to demonstrate the approach by the 2030s.
“From the technological point of view, the simplicity of the proposed equipment suggests that a prototype of this technology could be tested in the short term, following the trail of the launches proposed for Artemis and other exploration programs,” Ginés‑Palomares said. “Thus, 10 years may be a reasonable time frame.”
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In the meantime, the researchers plan to continue working toward paved lunar roads by subjecting their tiles to conditions similar to those that they would encounter on the Moon.
“We already considered some of the next steps of this project: firstly, the performance of the tiles under a rocket thrust should be tested,” Ginés‑Palomares said. “Then, the manufacturing in low gravity conditions should be addressed; this can be done in a parabolic flight campaign, for instance. This study has been conducted under terrestrial atmospheric and gravity conditions. Testing this equipment in lunar conditions on Earth (specifically, absence of air and lunar gravity) will be an important step towards bringing this and similar technologies to the Moon one day.”
“Of course it is a great thrill for us to be able to work on this type of project,” he concluded. “To think that we are contributing to the next steps of human exploration of the Moon, the dream of so many of us, makes us work with high motivation. That is why we would like to thank the European Space Agency, which has funded this project and is making the future of lunar exploration possible.”