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starship-design: Shielding info

About a month ago we discussed shielding properties.

Here I found a little bit of info about that subject:
(My guess is that some may have seen it before)


Space Settlements: A Design Study

Chapter 2 - Physical Properties of Space
     Matter in Space: A Major Resource

Chapter 4 - Choosing Among Alternatives

For passive shielding they suggest about 4.5 tonnes per square meter