光年 導覽選單
長度單位
光真空千米
光年
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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。
1隻分類:
- 長度單位
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