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The original was posted on /r/todayilearned by /u/Flubadubadubadub on 2025-07-22 07:13:42+00:00.

Original Title: TIL There is a classification of lifeform called Endolith that can live inside rocks and have a life cycle of thousands of years, it is also speculated they may exist in interplanetary objects such as comets and meteors thus supporting the Panspermia theory.