“麦哲伦”号探测器的穿云雷达揭示金星上有残破的火山口和广大的岩浆流。“麦哲伦”探测器刚刚完成了它的第一轮地形测绘,在一个金星年的243天里环绕轨道1700多圈,覆盖了这行星84％的表面。NASA金星计划的首席科学家史迪夫·柔德斯说,金星表面在4至10亿年之间,是相当年轻的。飞船发来的最近一幅图像有一个晕边,是约宽200公里的一个环形结构,晕边环直径在100公里到2000公里之间。它们也许形成于地壳下一层流动地幔里涌出的火热的岩石地幔柱的地方,正象地球上形成的热点。晕 The cloud-penetrating radar from the Magellan probe revealed a broken crater and a vast magma flow over Venus. The Magellan probe just completed its first round of topographical mapping, orbiting more than 1,700 laps in 243 days in a Venus year, covering 84% of the planet’s surface. Sturroft, the chief scientist at NASA’s Venus program, said Venus, which is between 400 and 1,000 million years old, is rather young. The most recent image from the spacecraft has a dizzy edge, a ring structure of about 200 km in width and a halo ring of about 100 km to 2000 km in diameter. They may form in the fiery rocky mantle plumes that flow from the flowing mantle beneath the earth’s crust, just as hotspots are formed on Earth. gosh