火星的螺旋北极
(原标题: The Spiral North Pole of Mars)
2025-07-06
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为什么火星北极周围会有一个螺旋？每年冬天，这个极点都会形成一个大约一米厚的新外层，由从稀薄的火星大气中冻结出来的二氧化碳组成。这一新鲜的冰层沉积在全年存在的水冰层上。由于这颗红色星球的旋转，强风从帽状行星的中心上方吹下来，并产生漩涡，这导致了Boreum的螺旋结构。这张特色图像是2017年由欧洲航天局火星快车拍摄的众多图像和美国宇航局火星全球勘测者任务上的激光高度计提取的海拔合成的透视马赛克。
查看原文解释
Why is there a spiral around the North Pole of Mars? Each winter this pole develops a new outer layer about one meter thick composed of carbon dioxide frozen out of the thin Martian atmosphere. This fresh layer is deposited on a water-ice layer that exists year round. Strong winds blow down from above the cap's center and swirl due to the spin of the red planet -- contributing to Planum Boreum's spiral structure. The featured image is a perspective mosaic generated in 2017 from numerous images taken by ESA's Mars Express and elevations extracted from the laser altimeter aboard NASA's Mars Global Surveyor mission.