光年 導覽選單
長度單位
光真空千米
光年
跳至導覽
跳至搜尋
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。
1隻分類：
- 長度單位
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