What would happen if the speed of light were 10 times faster?

The radiation pressure inside every star would be 100 times higher and most stars would explode. The fine-structure constant would be 10 times higher so electrons would be held near atomic nuclei with 100 times more energy making organic chemistry driven by solar radiation impossible. Black holes would be 10 times smaller, and although the force of gravity would not change, stars themselves would be smaller, denser and hotter and live much shorter lives I would suspect. As for cosmology, because the universe started out dominated by radiation pressure, with 100 times the pressure, the expansion would have been far faster than it actually was, and very little primordial helium would have been synthesized as the universe rushed through the temperature-density regime where this could have been possible.

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