Among the numerous actions Donald Trump has taken to unsettle international trade—such as imposing heavy tariffs and dismantling agreements—none would carry as much weight as a potential withdrawal that forces other nations to safeguard the Persian Gulf.
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Shielding adds another layer of complexity. For solar proton events, extra material helps a considerably. For galactic cosmic rays, the benefit becomes more counterintuitive: it is much smaller when very energetic ions hit spacecraft wall—or body itself—they can fragment and generate secondary radiation, including neutrons—and interactions in shielding generate secondary particles that complicate the picture further.
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