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总结
多家天文学与行星科学媒体报道，新研究结合火星地貌沉积证据与水文/气候推演提出，约30亿年前火星可能存在广泛湖泊乃至覆盖半球的海洋；当火星逐步变冷结冰时，湖面或形成较厚、相对透明的冰盖，充当隔热“冰盾”，使冰下水体在严寒环境中仍能保持相对温暖并延长液态水存在。维勒斯峡谷等地的陡崖前沉积被视为指示曾经最高水位的线索。相关结论强化火星早期“蓝色星球”设想，并为评估其潜在宜居性与未来探测选址提供参考。
正文
How Mars' ancient lakes grew shields of ice to stay warm as the Red Planet froze Space New Evidence That An Ancient Martian Ocean Covered Half The Planet Universe Today Scarp-fronted deposits record the highest water level in Mars' Valles Marineris | npj Space Exploration Nature Mars was half covered by an ocean Universität Bern Strong Evidence That Mars Was A "Blue Planet" 3 Billion Years Ago IFLScience
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