Part 9/12:
On Mercury, the daytime temperatures soar up to 430°C, and nighttime plunges to -180°C, making survival impossible in mere minutes. Venus's thick, toxic atmosphere and scorching surface temperatures of about 475°C mean death occurs almost instantly without protective gear.
Mars: A Possible Frontier (With Precautions)
Mars presents a more plausible environment for future colonization yet remains deadly in its current state. With a cold average temperature of -62°C and an atmosphere mostly of carbon dioxide, unprotected exposure would result in rapid asphyxiation and freezing—within minutes, death is unavoidable.