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However, Ceres lacks a substantial atmosphere and likely does not possess a global magnetic field. Therefore, any material emplaced or exposed on the surface will be subject to weathering by charged particles of solar and galactic origin. We have evaluated the effect of charged particle radiation on material within the near-surface of Ceres and find that the timescale for radiation-induced modification and destruction of organics and endogenic material is \u223c100 Myr to 1 Gyr within the top 10\u201320\u2009cm of the surface. Furthermore, we find that the timescale for sterilization of any putative living organisms contained within material at these depths is &lt;500 kyr. 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