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I thought about this when I came across wiens displacement law which says the higher the temperature, the lower the peak wavelength. If the sun was a lot hotter, and its peak wavelength wasn't in the visible part of the EM spectrum. How would this change the suns appearance to us?

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If the sun's surface would be hotter, then - instead of being white - it would look more bluish-white.

Even if it would be much hotter, and the spectral peak would be in far ultra-violet, then the visible part of the spectrum still would make it look bluish for our eyes.

This graphic from Wikipedia: Color temperature visualizes how the color of a Planckian light source depends on its temperature $T$.

Planckian locus

Actually there are stars with such high temperatures:
B-type stars (with $T > 10000 \text{ K}$) and O-type stars (with $T > 30000 \text{ K}$).

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