NASA Picks New Mission To Explore Massive Moon Cavern

A strange opening on the moon might lead straight into a massive underground world waiting below. NASA has officially picked a new mission to check this spot and figure out if it connects to a cavern big enough to protect future explorers from harsh radiation and freezing cold. This effort, called the Geophysical Instruments for Marius Lunar Pit Investigation or GIMLI, will use radar that punches through ground, seismic sensors that listen for vibrations, and tools to map gravity shifts beneath the surface.

The target sits in a region with some of the most varied volcanic history anywhere on the moon. The pit itself is roughly as deep as a ten-story building stands tall while its opening matches the size of an American football field. Scientists found this specific feature back in 2009 using Japan's SELENE spacecraft. It belongs to a group of about three hundred similar pits scattered across the lunar surface, many of which could serve as doorways into caves carved out by ancient eruptions.

The team announced their plans on Monday and stated they intend to study more than just the possible underground structure. Walls around the Marius Hills Pit reveal layers of regolith and lava flows that usually stay buried deep down. Looking at these exposed strata will show how lava moved across and beneath the lunar landscape over eons. It might also reveal whether separate eruptions happened with long breaks in between them rather than all at once.

This discovery offers a rare chance to peek inside a hidden world without sending humans there right now. Understanding what lies beneath could change how we plan future missions and where we build bases for sustained exploration. The data gathered here will tell us if these natural shelters are real or just myths formed by dust settling in strange patterns.

NASA has selected the Planetary Science Institute to head an investigation that could reveal whether a vast cavern lies beneath the lunar surface, one capable of shielding future explorers from deadly radiation and extreme heat. The American space agency stated clearly that if such a shelter exists under the moon, it will one day offer protection against the harsh environment astronauts face outside. Radiation on the lunar surface hits levels roughly 2.6 times higher than what orbiting crew members endure on the International Space Station, which circles about 250 miles above Earth. That same radiation is approximately 200 times stronger than anything humans experience back home. Exposure to these intense beams would put astronauts at serious risk for cancer, cell damage, and acute radiation sickness.

Instead of relying solely on observations from orbit, the GIMLI project will give researchers a chance to examine Marius Hills Pit directly from the ground itself. Than Putzig, an Associate Director and Senior Scientist at PSI, called this a long-held desire of his to bring intentional active-source seismic methods back into planetary science. He noted that such techniques have essentially gone unused since Apollo astronauts performed their first surveys on the moon decades ago. By combining these methods with ground-penetrating radar and gravity measurements, the team aims for a much better understanding of subsurface properties. They anticipate detecting a lava tube extending away from the Marius Hills Pit if conditions allow. Even without finding an underground cave, lunar pits remain valuable because their walls expose geology that otherwise stays hidden. Located in one of the most volcanically varied regions on the moon, this pit sits roughly 10 stories deep with an opening about the size of an American football field. Any underground spaces connected to these openings could also preserve evidence of volcanic processes that helped shape the moon.

Gareth Morgan, a Senior Scientist at PSI and Deputy Principal Investigator for GIMLI, explained that confirming a substantial lava tube would provide insight into how volcanism operated on the moon. Lava tubes are common features of basaltic volcanism here on Earth, so identifying them on the moon means scientists could use knowledge of such terrestrial caves to better understand lunar history. This project arrives as NASA plans to land astronauts on the moon during the Artemis IV mission in 2028. When the crew reaches the destination, two astronauts will descend to the surface and spend approximately a week near the South Pole conducting new science before returning to lunar orbit to join their crewmates for the journey back to Earth. The timing demands attention now, as the decision to proceed rests on whether these hidden spaces can be found in time for the next generation of explorers.