近日，科学家利用欧洲空间局（ESA）的火星快车号探测器和美国宇航局（NASA）的火星勘测轨道飞行器（MRO）数据，发现了火星近地表存在液态水的新证据。研究团队通过分析火星南极冰盖下方的雷达回波信号，识别出多个高反射区域，这些特征与地球冰川下湖泊的雷达信号高度相似，强烈暗示了液态水的存在。此前，2018年已有研究在火星南极冰层下约1.5公里处发现疑似液态水湖，但因信号微弱和环境极端（温度远低于水的冰点），科学界对此存有争议。此次新研究不仅确认了原有信号的可靠性，还发现了三个额外的高反射区，表明液态水可能并非孤立存在，而是一个更广泛的地下系统的一部分。科学家推测，这些水体之所以能在极寒环境中保持液态，可能是因为含有高浓度的盐分（如高氯酸盐），从而显著降低冰点。这一发现对理解火星地质演化、气候历史乃至潜在生命迹象具有重要意义。未来任务，如欧空局的“罗莎琳德·富兰克林”火星车，或将携带更先进的钻探和探测设备，进一步验证这些地下水源的真实性。
Recently, scientists have uncovered new evidence of liquid water beneath the surface of Mars using data from the European Space Agency’s (ESA) Mars Express orbiter and NASA’s Mars Reconnaissance Orbiter (MRO). By analyzing radar echo signals from beneath the Martian south polar ice cap, researchers identified multiple areas with high reflectivity—features strikingly similar to subglacial lakes detected under Earth’s ice sheets—strongly suggesting the presence of liquid water.Back in 2018, a study first reported a possible underground lake about 1.5 kilometers beneath the south polar ice. However, due to weak signal strength and the extremely cold environment (well below water’s freezing point), the finding remained controversial. The latest research not only reinforces the reliability of the original signal but also reveals three additional high-reflectivity zones, indicating that liquid water may not be isolated but part of a broader subsurface system.Scientists hypothesize that these water bodies remain liquid despite frigid temperatures because they likely contain high concentrations of salts—such as perchlorates—that drastically lower the freezing point. This discovery has profound implications for understanding Mars’ geological evolution, climate history, and potential for harboring life. Future missions, like ESA’s Rosalind Franklin rover equipped with advanced drilling and detection instruments, may provide further validation of these hidden reservoirs.
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