What are the two primary physical locations or materials suggested for shielding habitats against high radiation levels?

Answer

Burying structures under regolith or using natural lava tubes

Due to the lack of a thick atmosphere and global magnetic field, substantial shielding is necessary, achievable by burying structures under Martian soil (regolith) or adapting subterranean lava tubes for protection.

What are the two primary physical locations or materials suggested for shielding habitats against high radiation levels?

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Can We Live on Mars? - YouTube

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