Copyright:
原文:
The sprawling Caloris basin on Mercury is one of the solar system’s largest impact basins, created during the early history of the solar system by the impact of a large asteroid-sized body. The multi-featured, fractured basin spans about 1,500 kilometers in this enhanced color mosaic based on image data from the Mercury-orbiting MESSENGER spacecraft. Mercury’s youngest large impact basin, Caloris was subsequently filled in by lavas that appear orange in the mosaic. Craters made after the flooding have excavated material from beneath the surface lavas. Seen as contrasting blue hues, they likely offer a glimpse of the original basin floor material. Analysis of these craters suggests the thickness of the covering volcanic lava to be 2.5-3.5 kilometers. Orange splotches around the basin’s perimeter are thought to be volcanic vents.
中文翻譯:
🌌 金星的卡洛里斯盆地是水星上最大的撞擊盆地之一，於早期太陽系歷史中因一顆大型小行星的撞擊而形成。這張基於水星軌道上的MESSENGER太空船數據的增強色彩馬賽克圖像展現了這個多特徵、破碎的盆地，橫跨約1,500公里。卡洛里斯是水星最新的大型撞擊盆地，此後被熔岩填充，在馬賽克中看起來呈橙色。隨後災難性的撞擊留下的隕石坑，則從覆蓋的火山熔岩下挖掘出材料，顯示出對比鮮明的藍色色調，這可能讓我們瞥見原本盆地底部的材料。對這些隕石坑的分析顯示，覆蓋的火山熔岩厚度約為2.5到3.5公里。盆地邊緣周圍的橙色斑點被認為是火山噴口。
#水星 #卡洛里斯盆地 #太陽系 #太空探索 #MESSENGER #火山熔岩 #隕石坑 #科學探索 #自然奇觀 #宇宙知識 #天文學 #空間研究
來源:NASA每日圖片
