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光年 導覽選單

Multi tool use
Multi tool use

長度單位


光真空千米












光年




出自維基百科






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光年（light-year）係隻長度單位，指話光到真空行一年咁遠。大概九萬四千六百億千米，準確嗰定義：光到31557600 秒（365.25 日）嗰時間，到自由空間即係離磁場無限遠嗰地方，行嗰距離，真空嗰光速係每秒 299,792,458 米，一光年就係 9,460,730,472,580,800 米。









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