光時(Light hour)是長度單位之一,是於一小時真空所行走的距離,一光時相等於1,079,252,848,800米(~ 1.08兆米)。但由於以光時這個單位測量恆星顯得太小,而測量太陽系天體又顯得太大,因此這個單位不常用。

冥王星的公轉軌道半徑約為5.473光時。

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