Mercury is the closest planet to the Sun, yet it experiences the most extreme temperature differences in our solar system. During the day, Mercury’s surface can reach temperatures of around 430°C, while at night it can drop to nearly –180°C. This video explains the real scientific reasons behind Mercury’s extreme heat and cold, including the role of solar radiation, gravity, solar wind, and the absence of a strong atmosphere. A calm, factual explanation based on verified space science observatio