NASA's hunting for a secret underground cave on the moon

Will future astronauts take shelter in moon caves?

Are there secret underground caves on the moon? NASA has a new program that aims to find out.

Though we see it in the sky most nights, the moon still holds an incredible amount of mystery. One such mystery is a large underground cave, or a cavernous tube carved out by ancient lava, that scientists think extends past a particular pit on the moon's surface. And to get to the bottom of it, NASA has selected a project known as GIMLI (the Geophysical Instruments for Marius Lunar pit Investigation, not the character from Lord of the Rings). GIMLI was <u>selected along with two other programs</u> that are all intended to expand our understanding of the moon to better support a future moon base, which NASA aims to build near the south pole.

"NASA Science is building the ultimate interplanetary survival guide to ensure that science goes first to the lunar surface to provide our future astronaut crews with the vital information, resources, and safety precautions needed ahead of time to survive the night on the moon," Nicky Fox, NASA's associate administrator for the Science Mission Directorate, <u>said in a statement</u>.

Lunar mysteries

The site of this investigation will be the Marius Hill Pit, <u>which was discovered</u> in 2009 by Japan's Kaguya moon orbiter. You can see the pit clearly in the probe's images. But researchers think that there's more there than just a large hole in the lunar surface.

Theythink it's possible that the pit is connected to a vast, underground cave likely created by lava flowing in the ancient past. If true, this could shed light on the history of volcanic activity on the moon.

"Confirming a substantial lava tube would give us an insight into how volcanism operated on the moon," GIMLI deputy principal investigator Gareth Morgan said in a different statement. "Lava tubes are a common feature of basaltic volcanism on Earth, so identifying them on the moon means we could use knowledge of such terrestrial caves to better understand lunar history."

Even more, if researchers confirm the presence of this lava tube, astronauts could potentially use it as a natural shelter on the lunar surface. These lava-made caves would provide general shelter as well as protection from the extreme temperatures and radiation exposure experienced on the moon's surface. Lava tubes could also be a safe "bunker" of sorts where future astronauts could be shielded from micrometeorites. While a future moon base will probably have human-made shelters included, natural caves could be an incredible, existing resource that astronauts could tap into.

How to find a moon cave

GIMLI will work directly on the lunar surface, scanning beneath to look for signs of the lava tube. This investigation comes from a proposal led by the nonprofit Planetary Science Institute (PSI) and will be funded through NASA's Payloads and Research Investigations on the Surface of the Moon (PRISM) program.

The investigation is partnering with Honeybee Robotics to help build the equipment and instrumentation that will be necessary for the study. This gear will get to the moon aboard a lander and rover via NASA's Commercial Lunar Payloads Services program, and the data collected will be studied by a team led by PSI associate director and senior scientist Than Putzig. The work done by PSI will be in partnership with the Norwegian Space Agency.

From the lunar surface, GIMLI will gather data using ground-penetrating radar, seismic sensors and a gravimeter to better understand what's really happening underneath the surface. These measurements will allow GIMLI to determine if there is a subsurface lava tube and, if so, how big it is. Could it fit an entire astronaut crew? We will have to wait and see.

Chelsea Gohd served as a Senior Writer for Space.com from 2018 to 2022 before returning in 2026, covering everything from climate change to planetary science and human spaceflight in both articles and on-camera in videos. With a M.S. in Biology, Chelsea has written and worked for institutions including NASA JPL, the American Museum of Natural History, Scientific American, Discover Magazine Blog, Astronomy Magazine, and Live Science. When not writing, editing or filming something space-y, Gohd is writing music and performing as Foxanne, even launching a song to space in 2021 with Inspiration4. You can follow her online @chelsea.gohd and @foxanne.music

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