In my opinion, therefore, the problems underlying public acceptance seem to be ordered (Table 2) in inverse order to the actual order of technical severity except for the real hazards of space — item 2. The seriousness of this inversion of problems in the public minds is confirmed by other studies. For example, Gutman (8) lists environmental issues in three categories of decreasing severity shown in Table 4. Under Level 1 — Potential show-stoppers, he lists microwave exposure standards, ozone problems, and space radiation hazards to crews. Under Level 2, he lists
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