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When molten lava flowed across the Moon's surface, it would often harden along the edges, creating a crust. The liquid lava beneath continued flowing, leaving behind a hollow tunnel – a lava tube.

If you encountered "TransientLuna" somewhere related to the Moon, it's likely short for "Transient Lunar Phenomena" (TLPs). These are short-lived changes in brightness, color, or appearance on the Moon's surface. They can include flashes of light, wispy clouds, or changes in brightness or color of specific regions. TLPs remain a bit of a mystery, with various possible explanations like outgassing, electrostatic discharges, or even observational errors.

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These vast caves formed by ancient lava flows could potentially offer shelter for future lunar settlements, but also hold secrets about the Moon's volcanic history. Could some tubes harbour frozen ice deposits or strange geological formations?

Some astronauts have reported flashes of light or wispy clouds on the Moon. Are these real, or hallucinations caused by fatigue or the harsh lunar environment? What could they be caused by?