In this blog post, we’ll explore how Venus lost its water due to an extreme greenhouse effect and the loss of its magnetic field, eventually transforming into a hellish planet where no life can survive.
Venus is like a giant steamer basket. This is because the heat it receives from the Sun cannot escape the atmosphere, causing it to constantly boil. The surface temperature reaches a staggering 470 degrees Celsius—enough to make water boil the moment it touches the surface, melt lead into a liquid, and even cause iron to glow red-hot. It is truly a hellish environment where no life can survive. So why did Venus become this way?
Venus’s tragedy begins with the fact that it lacks a magnetic field. For a magnetic field to form, three conditions are necessary: a liquid metallic core, internal convection, and rapid rotation, but Venus fails to meet all three. Its rotation speed is 243 times slower than Earth’s, and internal convection has nearly stopped. As a result, it could not block the solar wind, and its atmosphere was continuously stripped away over hundreds of millions of years. Light hydrogen disappeared first, and eventually, all the water was lost as well. Furthermore, unlike Earth, Venus’s crust did not split into multiple plates but solidified into a single massive slab, preventing internal heat from escaping. This heat accumulated and erupted all at once, turning Venus into a planet covered by thousands of volcanoes. The carbon dioxide and sulfuric acid gases released by volcanic activity formed a thick atmosphere, which reflected sunlight while trapping heat, creating an extreme greenhouse effect. As a result, Venus became a hotter planet than Mercury, which is closer to the Sun.
Interestingly, Venus may have had a past different from its present state. Since the early Sun was dimmer than it is today, Venus may have once maintained a relatively mild environment, and the possibility of oceans has been raised. However, there are opposing views suggesting that Venus had almost no water from the beginning or was inherently a high-temperature environment, so the debate continues. On present-day Venus, a phenomenon occurs where metals appear like “snow” instead of water. Metal components in the atmosphere condense at high altitudes and accumulate in thin layers on mountain peaks, giving them a snow-like appearance. Additionally, sulfuric acid rain falls from Venus’s clouds, but it all evaporates before reaching the surface. Lightning and super-massive storms are also believed to exist, and atmospheric circulation is intensified by the planet’s slow rotation.
Venus also has a unique direction of rotation. Because it rotates in the opposite direction of Earth, the Sun rises in the west and sets in the east. This has led to the theory that a massive collision in the past may have flipped its axis of rotation. Furthermore, a year on Venus is shorter than a day. This is because its orbital period is about 225 days, while its rotational period is about 243 days. In other words, a year ends before a single day has passed. Meanwhile, since the atmosphere of Venus is relatively stable at an altitude of about 48 km, some scientists have suggested the possibility of microbial life existing there. However, there is currently no definitive evidence to support this. Finally, Venus, like the Moon, undergoes phase changes, but because it is close to the Sun, observation is difficult and requires specialized equipment and timing.
As such, Venus is a planet where extreme environments and unique characteristics coexist, and it is considered one of the most dramatic examples of transformation in the solar system.
