China is the latest nation to study lunar lava tubes as locations for bases. They provide natural protection that's impossible to ignore.
Caves were some of humanity’s first shelters. Who knows what our distant ancestors were thinking as they sought refuge there, huddling and cooking meat over a fire, maybe drawing animals on the walls. Caves protected our ancient ancestors from the elements, and from predators and rivals, back when sticks, stones, furs and fire were our only technologies.
Lava tubes are also called pyroducts. They formed when lava flowing across the surface of the Moon began to cool. The top of the flowing lava formed a hardened crust, but the molten lava kept flowing underneath it and eventually drained, leaving an empty tube. They’re here on Earth as well. Radiation is also hazardous on the lunar surface. It can be as much as 150 times more powerful than on Earth’s surface. That’s deadly, but in lunar caves astronauts would be sheltered by several metres of overhead rock. That’s a thick enough barrier to provide effective protection.
Most of what we’ve found on the Moon are vertical-opening tubes, but that may be because of our overhead view. The openings are called skylights, where the ceiling has collapsed and left a debris accumulation on the floor of the tube directly below it. Entering through these requires either flight or some type of vertical lift equipment.
Auxiliary vehicles can separate from the main probe to perform more reconnaissance and help with communications and “energy support.” They could be diversified so the mission can meet different challenges. They might include multi-legged crawling probes, rolling probes, and even bouncing probes. These auxiliary vehicles would also have science instruments to study the lunar dust, radiation, and the presence of water ice in the tubes.
But regardless of when they start, China seems committed to the idea. Ding Lieyun, a top scientist at Huazhong University of Science and Technology, told the China Science Daily that “Eventually, building habitation beyond the Earth is essential not only for all humanity’s quest for space exploration but also for China’s strategic needs as a space power.” This language almost exactly mirrors the language used by NASA when talking about its Artemis program.
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