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Schyte96 t1_j6oqcif wrote

On planets or the moon: Underground. Dirt and rocks make for good radiation shielding. On spacecraft that fly for long (such as to Mars) probably water tanks. Water is also an ok radiation shield. Not as good as a dense metal, but it's also something you will need to bring anyways.

There is also an electromagnetic radiation shield NASA is working on. I think there were some news on it about a year or so ago.