Title: Moon‘s Extreme Temperature Fluctuations: Hotter than a Sauna, Colder than the Arctic
Despite its serene, cold, and seemingly lifeless appearance, the Moon isn’t always the chilly celestial body it appears to be. In fact, the Moon’s surface temperature swings from scorching heat to icy cold are among the most extreme in our solar system, second only to Mercury.
From our perspective on Earth, the Moon appears as a static, gray, and dormant sphere. However, scientists have discovered that its surface temperature isn’t consistently low, but rather varies according to the Sun‘s rays striking it. This dramatic fluctuation makes the Moon an intriguing object of study.
Professor of astronomy at the University of Michigan, John Monnier, explains, "The Moon’s temperature can range from extremely hot to extremely cold." This range is vast, spanning from a frigid -100°C to a sweltering 121°C, hotter than a typical sauna, according to data from NASA.
In contrast, Earth’s average surface temperature is a relatively stable 15°C, ranging from -89°C to 57°C. While both celestial bodies have nearly equal distances from the Sun, around 93 million miles (150 million kilometers), there are several reasons for their differing temperatures.
Earth’s atmosphere traps heat and maintains a habitable temperature, while the Moon, lacking an atmosphere, is exposed to full sun radiation. Additionally, Earth’s oceans absorb and store solar energy, slowly releasing it at night, whereas the Moon’s rocky surface rapidly heats up or cools off under sunlight or darkness.
The Moon’s regolith, or soil, acts as an excellent insulator, retaining both heat and cold. As a result, temperatures vary significantly across its surface. Near the lunar equator, temperatures can soar to 121°C when exposed to sunlight and plummet to -133°C in darkness, ranking it the second most extreme thermal environment in our solar system, after Mercury.
Understanding these temperature fluctuations across the Moon’s surface is crucial for future exploration and habitation plans. Before contemplating extended human stays on the Moon, we must first develop equipment capable of withstanding these severe temperature swings.