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Solar sails, the thin shiny square seen in this artist’s rendition of the Japanese IKAROS spacecraft, could propel a spacecraft to 10% the speed of light. Andrzej Mirecki via Wikimedia Commons, CC BY-SA
Solar sails, the thin shiny square seen in this artist’s rendition of the Japanese IKAROS spacecraft, could propel a spacecraft to 10% the speed of light. Andrzej Mirecki via Wikimedia Commons, CC BY-SA