Science & technology | Lunar living

Pressurised natural caves could offer a home from home on the Moon

It would make building bases a lot cheaper and easier

The Grotta Cassone is a very straight 246 m-long tunnel that formed within a lava flow beneath the southern flank of Mount Etna in Sicily. The striking dark black basaltic rocks are over 8m high in some places and up to 10m wide, whilst the lava that has solidified on the floor has a corded, rippled texture. Many similar lava tubes have been discovered on Mount Etna as a result of road construction on the volcano.
Spelunking in spaceImage: Robbie Shone

Imagine a habitable colony on Mars or the Moon and the kinds of structures that come to mind are probably gleaming domes or shiny metallic tubes snaking over the surface. But with no Earth-like atmosphere or magnetic field to repel solar radiation and micrometeorites, space colonists would probably need to pile metres-thick rocks and geological rubble onto the roofs of such off-world settlements. More like a hobbit hole than Moonbase Alpha.

This article appeared in the Science & technology section of the print edition under the headline “Lunar living”

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