I suggest that stars introduce mass and density scales that lead to `naturalness’ in the Universe (paper posted to the arXiv). The combination of the stellar mass scale with the Planck mass and the Chandrasekhar mass leads to a ratio of order unity. In the pure fundamental particles domain there is no naturalness; either naturalness does not exist or there is a need for a new physics or new particles. The `Astrophysical Naturalness’ offers a third possibility: stars introduce the combinations of, or relations among, known fundamental quantities that lead to naturalness.
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