从比皮可伦坡拍摄水星的维瓦尔第陨石坑
(原标题: Mercury's Vivaldi Crater from BepiColombo)
2024-09-16
浏览次数: 19
为什么水星上的这个大陨石坑有两个环和一个光滑的地面？没人能确定。这个不寻常的特征被称为维瓦尔第陨石坑，横跨215公里，由欧洲航天局和JAXA的机器人BepiColombo宇宙飞船在本月早些时候飞越时再次拍摄了非常详细的照片。岩石行星或月球上的大圆形特征通常是由小行星或彗星碎片的撞击或火山喷发造成的。就维瓦尔第火山而言，这两种情况都有可能发生——一次猛烈的撞击导致了内部熔岩的顺畅流动。双环环形山是罕见的，内环的成因仍然是一个研究课题。BepiColombo号在重力辅助下减速飞掠水星，是为飞船在2026年进入太阳系最内侧行星的轨道做准备。
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Why does this large crater on Mercury have two rings and a smooth floor? No one is sure. The unusual feature called Vivaldi Crater spans 215 kilometers and was imaged again in great detail by ESA's and JAXA's robotic BepiColombo spacecraft on a flyby earlier this month. A large circular feature on a rocky planet or moon is usually caused by either an impact by a small asteroid or a comet fragment, or a volcanic eruption. In the case of Vivaldi, it is possible that both occurred -- a heavy strike that caused a smooth internal lava flow. Double-ringed craters are rare, and the cause of the inner rings remains a topic of research. The speed-slowing gravity-assisted flyby of Mercury by BepiColombo was in preparation for the spacecraft entering orbit around the Solar System's innermost planet in 2026.