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土卫六表面存在液体的证据增强了土卫六和地球之间的相似性,土卫六是太阳系唯一具有活跃气候循环的星体,其表面的湖泊蒸发液体形成云层,然后降雨再返回至表面,形成河流和通道。这使得土卫六成为太阳系最佳支持生命体存在的候选者之一。

如果土卫六存在液态湖泊,那么其表面必然存在着风流。早期的计算机模拟预测土卫六湖泊波浪是地球湖泊波浪的7倍高。

泽伯克尔说bai:“这项最新研究与之前的推测背道而驰,这是一种特殊的湖泊,很可能其表面较为粗糙,但是我们并未观测到起伏波浪的迹象。

虽然我们并不清楚低温状态下甲烷和乙烷的物质特性,但我们推测该湖泊的液体非常稠密,具有一定的黏性,就像是蜂蜜一样。”

研究人员指出土卫六极地存在着交替的季节,能够缓和调节恶劣的气候。但是其季节变更非常慢,土卫六1年的时间相当于地球30年的时间。

美国亚利桑那州立大学的乔纳森-卢宁(JonathanLunine)说:“这是土卫六极地区域一年时间内处于静止休眠状态的阶段,总地来讲,土卫六表面湖泊充满液体的证据是确凿的,我们认为安大略湖充满着液体。”

这章没有结束,请点击下一页继续阅读!泽伯克尔称,我们下一步还必须深入分析该湖泊的中部,通过一些间接的测量方法和模型进行分析。

由美欧意联合开发的卡西尼号土星探测器在土星的最大卫星土卫六上发现了一个奇怪的痕迹,酷似埃及的尼罗河,从其“源头”到土卫六上的“大型海洋”长度达到了近400公里,约为250英里,是迄今发现的最长“外星河流”,而卡西尼号探测器上的高分辨率雷达成像系统为科学家们揭示了土卫六存在的“黑暗河流”,而且具有蜿蜒状的光滑性质,暗示其中可能存在某种液体。

以往对土卫六的观测研究显示,土卫六是太阳系中除了地球以外唯一存在辽阔“海洋地貌”的天体,并且有着表面液体循环机制,然而土卫六大气环境确实非常寒冷的,这意味着即便是有水存在也无法自由流淌。

科学家认为土卫六上的液体由液态甲烷、乙烷等碳氢化合物组成。有趣的是,在卡西尼号探测器显示的土卫六河流系统并不是一个完整通畅的沟渠,而是存在部分的断层线,这个信息暗示了土卫六基岩中存在断裂现象。

土卫六是人类所发现的唯一一个表面存在稳定液态物质的星体,只不过这些液态物质并不是水,而是乙烷或甲烷等烃类物质。

据英国《每日邮报》网站的报道,美国国家航空航天局抄(NASA)的科学家借助土星探测器“卡西尼”号在土卫六表面发现了一条长约400公里、流着液态烃(碳氢化合物)的河谷,其外形与地球上的尼罗河很相似。

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