From Earth, the Moon looks like it’s covered in holes, but those are really dents—impact craters from space rocks hitting it over billions of years. The Moon does have actual holes that could be caves and might one day shelter astronauts. NASA has recently approved a new mission that hopes to explore that exact possibility.

According to research from the Planetary Science Institute, NASA’s Payloads and Research Investigations on the Surface of the Moon (PRISM) program selected a mission called GIMLI (named after your favorite surly Lord of the Rings dwarf) to inspect the Marius Hills Pit, a hole in our moon that’s nearly 300 feet across.

It’s believed to be a “skylight,” the collapsed roof of an ancient, massive subterranean lava tube.

A Giant Hole in the Moon Could Lead to a Future Astronaut Hideout

A lot of billionaires with space on their minds dream of building some kind of habitat on the moon, but since the lunar surface is an inhospitable wasteland that’s constantly being bombarded with deadly cosmic radiation and experiences extreme temperature swings ranging from 200 degrees Fahrenheit down to -208 degrees Fahrenheit, that dream is, for now, nearly an impossibility.

But those underground lava tubes might offer a natural, climate-controlled bit of insulation, since Mare Tranquillitatis pit temperatures are known to be a much cozier 63 degrees Fahrenheit, putting it on par with the average annual temperature of lovely Laguna Beach, California, though I don’t think the views on the moon will be quite as beachy.

To make sure the pit opens into an actual cavern, GIMLI’s lander and rover will deploy ground-penetrating radar and seismic probes to send back as much information to Earth as possible. If there is a cool cave system, sound waves and gravitational mapping will reveal its true size. And even if we don’t find a habitable underground lair, possibly already inhabited by moon people, we’ll at least learn a little more about how ancient volcanic eruptions helped form the lunar crust.

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How Many People Are In Space Right Now doesn't have a question mark, but it does give the answer: 10 humans, as of Friday, September 18, 2026, all on the International Space Station and Tiangong space station.

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This tasty cookie is made from plastic soda bottles and farm waste, like corn stalks and leaves. And it is 3D printed.

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