If space was hot instead of cold ,the universe would experience catastrophic changes affecting matter, life and cosmic structures. If space was hot this would require an enormous influx of energy, such as supercharged sun or wide spread cosmic energy sources. The vacuum itself still limit heat transfer but regions near stars and planets would become extremely hostile.
High temperatures in space would destabilize matter. Planets, moons and asteroids could experience surface melting or vaporization, depending on their composition. Ice-rich bodies like comets would evaporate rapidly and atmospheres could be stripped away from planets due to intense thermal energy.
Life, as we know it would be nearly impossible . Biological molecules ,including DNA and proteins are highly sensitive to heat. A hot space environment would prevent the formation of stable planetary surfaces and oceans, eliminating the conditions necessary for life. Any existing life on planets like earth would face extreme thermal stress, potentially leading to mass extinction.
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