Of the category M type, at 4,000 degrees Kelvin
The effective surface temperature would be significantly less if our Sun would be powered by a low-level plasma-fusion process. Its surface temperature would then be of the category M type, at 4,000 degrees Kelvin, or slightly less. This would be enough to shift the climate into deep glaciation conditions that we had in the previous glaciation period that we call the Ice Age.
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