NASA has awarded $175,000 to Austin-based Stone Aerospace to develop the Lunar Underground eXplorer (LUX). This drone concept uses a fiber-optic tether to navigate the dark, subterranean lava tubes of the Moon.
A fiber-optic lifeline for the LUX drone
Stone Aerospace’s LUX concept departs from traditional battery-dependent robotics by utilizing a physical connection to a surface rover. According to the report, a fiber optic cable will transmit high-speed data, deliver electricity, and provide laser-enhanced thrust for a cold-gas propulsion system. This method avoids the signal blockage common in rocky lunar environments where radio waves struggle to penetrate deep into the crust.
Gilly Elor, the physics lead at Stone Aerospace, noted that this approach could enable the first-ever exploration of alien cave systems. by using a tethered system, the drone bypasses the weight penalties of heavy onboard batteries, allowing for more specialized scientific instrumentation. The use of optical power delivery also offers a potential solution for mobile platforms operating in environments where solar energy is completely unavailable.
Targeting the 436-foot Mare Tranquillitatis skylight
The mission targets the Mare Tranquillitatis skylight, a massive pit located roughly 250 miles from the historic Apollo 11 landing site. This opening, which spans the area of two football fields and descends 436 feet, was identified as a potential entrance to vast lava tubes by NASA's Lunar Reconnaissance Orbiter. These subterranean networks are believed to be ancient lava tubes that could stretch for thousands of feet.
These caverns could eventually serve as vital habitats for future astronauts,offering protection from extreme temperatures and solar radiation. the research into these sites is part of a larger $3.2 million disbursement through NASA's Innovative Advanced Concepts program. This funding aims to move beyond incremental improvements and toward the radical technologies required for long-term lunar habitation.
The challenge of navigating GPS-free lunar voids
Several critical technical hurdles remain unaddressed by the current preliminary research phase. The LUX drone must operate in total darkness without the benefit of a GPS network to guide its movements through unmapped three-dimensional spaces. Navigating a pitch-black, jagged environment requires a level of autonomy that current robotic systems are still perfecting.
Furthermore,the report does not specify how the drone will maintain autonomous stability if the fiber-optic tether becomes snagged or tangled within the uneven terrain of the lava tubes. There is also the significant requirement that the drone's propulsin system must be entirely non-polluting. This ensures that the exploration process does not contaminate the pristine cave environment, which would compromise the integrity of any scientific measurements regarding the Moon's history.
Scaling the technology for Martian microbial life
NASA’s interest in this study is part of a broader strategy to return to the Moon and eventually advance to Mars. Stone Aerospace believes the tethered laser-power model is not limited to the Moon but could be adapted for the Martian surface. The same principles of tethered, laser-powered exploration could be applied to the complex cave systems found on the Red Planet .
Such technology could be essential for investigating Martian caves, where scientists hope to find evidence of past or present microbial life. Greg Stover, NASA's director of Advanced Research and Technology, emphasized that achieving such ambitious visions requires great leaps rather than incremental advancements. By proving the feasibility of the LUX concept on the Moon, researchers hope to pave the way for much more complex missions to Mars in the coming decades.
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