Reaching the moon involves numerous incremental advancements, such as Europe’s recently established LUNA training center. However, more work remains ahead. The next milestone will be developing a lunar gravity simulation facility.
If you aimed to replicate the Moon here on Earth, you'd require these three key components:
a sandy material with a chemical composition like regolith (lunar soil) special lighting to mimic the angle of the sun a moon gravity simulator (the moon's gravity is one-sixth of the Earth's gravity)Plus, a gigantic enclosure to contain everything, similar to a large steel warehouse.
When the German Aerospace Center (DLR) and the European Space Agency (ESA) presented their interpretation of the Moon — the LUNA Analog Facility In late September 2024, they had progressed to about two-thirds of their representation of the moon's peculiar terrain. However, one key component was still lacking.
Darkness enveloped everything until a spotlight illuminated two entirely suited astronauts — Germany’s Matthias Maurer and France’s Thomas Pesquet.
Maurer and Pesquet traversed the hangar, which spanned an area of 700 square meters (about 7,500 square feet) filled with simulated lunar soil. This material was derived from the volcanic ash of Italy’s Mount Etna, the Eifel district in Germany, as well as stones from Norway.
Armed with extended scoops, a mock-up moon buggy, and accompanied by a robotic canine, the duo simulated an exploration mission across the artificial lunar terrain for roughly 100 VIPs.
As they strolled along, the lighting was positioned precisely to mimic how sunlight might blind an astronaut upon their potential return to the moon this decade.
But they walked — they didn't float as seen in video clips from The 1969 Apollo 11 space mission — Because LUNA lacks lunar gravity.
Gravity simulation: The missing component of the LUNA mystery
To the backdrop of an evocative film score, Maurer and Pesquet showcased how they planned to gather specimens and investigate a lunar crater on the actual moon. This display was quite impressive for the attending politicians and space agency representatives, who enthusiastically congratulated the astronauts with fist bumps for the benefit of both television viewers and their production teams.
Yet it seemed so terrestrial due to its lack of lunarlike gravitational pull. This is an issue the engineers haven't resolved yet.
Previously, astronauts relied on parabolic flights and swimming pools to mimic and feel the conditions of zero or microgravity.
During parabolic flights, specially modified jets achieve weightlessness by climbing and diving at approximately 45 degrees from high altitudes.
Swimming pools used for astronaut training are also specifically designed, with astronauts practicing simulated activities in their suits.
However, none of these solutions would be feasible for the LUNA Analog Facility since it is located on solid ground.
Rather than that, engineers aim to create a "gravity offset system," according to Andrea Emanuele Maria Casini, an aerospace engineer overseeing the LUNA project.
"As if you were suspending the astronauts like marionettes," Casini explained.
Wires will be connected to the outside of the astronauts' space suits, probably exerting tension when they walk and holding them up when they leap.
The project remains in the prototyping stage. Until its debut, Casini concurred: LUNA is an extremely costly sandbox. However, ultimately, they will aim to test new technologies and train astronauts within a contained setting.
As he stated, 'The magic occurs within,' Casini added. 'This landscape will assist the upcoming cohort of astronauts in returning to the moon.'
Moreover, there’s potential for growth. Adjacent to the LUNA Analog Facility, you’ll find two extra components: a habitat simulator and a converted greenhouse from the EDEN ISS project, designed to simulate crop production in frigid extraterrestrial conditions.
Next to the primary hall, there is an empty plot of land that could potentially serve as a site for a future "LUNA 2" project or a Mars simulation area.
The moon was brought down to Earth.
The LUNA Analog Facility has undergone development for 12 years. Maurer, who has logged 177 days in orbit, He has been driving this idea since day one. He informed Candrokey News that the facility accurately depicted the conditions on the moon, even without the gravity offset system.
When I descend into the crater at the facility and am completely exposed to the sun’s rays, it blinds me," Maurer stated. Additionally, since he is inside the crater, the rim casts a shadow over everything ahead, leaving his vision shrouded in darkness.
This stress test subjects astronauts to challenging and occasionally conflicting circumstances similar to those they'll face on the lunar surface.
An additional challenge stems from the moon's regolith. According to Maurer, this represents a significant technological hurdle. It wreaks havoc with all electronic devices, infiltrates mechanical components causing blockages, and even affects spacesuits. However, we have the capability to simulate these conditions for testing purposes.
Links around the globe
LUNA has the capability to connect with various mission control centers worldwide, including those such as DLR in Cologne and the German Space Operations Center (GSOC) located in Munich, along with NASA’s facilities in Houston, USA, and even the International Space Station.
This indicates that simulations might be conducted from afar, allowing NASA astronauts, such as those based in Germany, to go through mission rehearsals guided by their teams located in the United States.
Once operational, the LUNA Analog Facility will serve as a symbol of Europe’s dedication to space exploration, according to Kai-Uwe Schrogl, an advisor specializing in political matters at the European Space Agency.
LUNA lends credibility," Schrogl stated. "While many speak of venturing to the moon and further into space, having just a handful of rockets or a lander at the conceptual stage isn’t enough. It’s essential to possess such facilities to demonstrate your commitment.
In addition to supporting NASA's Artemis mission, Europe aims to reach the Moon by the 2030s with its own initiatives. The LUNA Analog Facility represents just one of several smaller efforts toward this objective.
Edited by: Zulfikar Abbany
Author: Matthew Ward Agius