| http://www.w3.org/ns/prov#value | - Their other papers looked at topics including sail thickness, the performance of a single-layer sail, the relative merits of different metallic films, and whether it is wise to mitigate the electrostatic pressure that ultraviolet radiation causes when it ionizes the sails, creating a positive charge. (An ionized sail will deflect protons hurled by the solar wind, which transfer their momentum and i
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