Venus: Divergent outcomes of terrestrial planet formation

E. Stofan
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Abstract

Although Venus is often referred to as the most Earth-like of the terrestrial planets, its runaway greenhouse has resulted in a dry, hot, uninhabitable surface. Its surface geology is complex, with volcanoes ranging from 500 km across, lava flows fields >800km across, mountain belts, rift zones, and terrains unique to Venus such as tesserae and coronae. It surface has an average crater retention age similar to Earth's continents, but the random nature of the impact crater population renders it useless in providing time constraints for the geologic history of Venus. At some point in the past, Venus lost an ocean's worth of water. If this water persisted on the surface for long periods of time in Venus's early history, life may have evolved. Untangling, the complex history of Venus, and what it reveals for the evolution of habitable planets, will require future missions to the surface.
金星:类地行星形成的不同结果
虽然金星常被认为是类地行星中最像地球的,但它的温室效应失控,导致其表面干燥、炎热、不适宜居住。它的地表地质很复杂,火山跨度从500公里到800公里不等,熔岩流场跨度超过800公里,还有山脉带、裂谷带和金星特有的地形,如泰塞拉和日冕。它的表面有一个与地球大陆相似的平均陨石坑保留年龄,但陨石坑数量的随机性使得它在为金星的地质历史提供时间限制方面毫无用处。在过去的某个时候,金星失去了相当于一个海洋的水。如果这些水在金星早期的历史中长期存在于表面,生命可能已经进化了。解开金星复杂的历史,以及它揭示的可居住行星的进化,将需要未来对其表面进行探测。
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