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Params: post, 337986, a:20:{i:0;s:209:"据外媒报道,现代火星是一个贫瘠的世界,比地球上任何沙漠都干燥。但地质证据表明,情况并非一直如此--在遥远的过去,这颗红色星球上曾有过流动的水。";i:1;a:4:{s:3:"tag";s:1:"b";s:6:"option";N;s:8:"original";a:2:{i:0;s:3:"[B]";i:1;s:4:"[/B]";}s:8:"children";a:1:{i:0;s:147:"长期以来,人们一直认为古代火星温暖潮湿,但一项新的研究发现,它被冰盖覆盖,且大部分水都是冰川径流。";}}i:2;s:2:"
";i:3;a:4:{s:3:"tag";s:6:"center";s:6:"option";N;s:8:"original";a:2:{i:0;s:8:"[CENTER]";i:1;s:9:"[/CENTER]";}s:8:"children";a:1:{i:0;a:4:{s:3:"tag";s:3:"url";s:6:"option";s:66:"https://static.cnbetacdn.com/article/2020/0804/ea689fde35a31d5.jpg";s:8:"original";a:2:{i:0;s:74:"[URL='https://static.cnbetacdn.com/article/2020/0804/ea689fde35a31d5.jpg']";i:1;s:6:"[/URL]";}s:8:"children";a:1:{i:0;a:4:{s:3:"tag";s:3:"img";s:6:"option";N;s:8:"original";a:2:{i:0;s:5:"[IMG]";i:1;s:6:"[/IMG]";}s:8:"children";a:1:{i:0;s:96:"https://rdimg.com/proxy/https://static.cnbetacdn.com/thumb/article/2020/0804/ea689fde35a31d5.jpg";}}}}}}i:4;s:2:"
";i:5;a:4:{s:3:"tag";s:4:"left";s:6:"option";N;s:8:"original";a:2:{i:0;s:6:"[LEFT]";i:1;s:7:"[/LEFT]";}s:8:"children";a:1:{i:0;s:231:"有很多证据表明火星曾经比现在要更湿润。通过在火星空中的轨道飞行器和地面的探测器,我们人类看到了这颗星球曾经拥有过海洋、海岸线、湖泊、河流和洪泛平原的痕迹。";}}i:6;s:2:"
";i:7;a:4:{s:3:"tag";s:4:"left";s:6:"option";N;s:8:"original";a:2:{i:0;s:6:"[LEFT]";i:1;s:7:"[/LEFT]";}s:8:"children";a:1:{i:0;s:252:"所有这一切使得科学家们推测火星曾经跟地球非常相似,它有着温暖、温和的气候和规律的降雨。但现在,一项来自英属哥伦比亚大学的新研究发现,这个故事并不能解释所看到的所有结构。";}}i:8;s:2:"
";i:9;a:4:{s:3:"tag";s:4:"left";s:6:"option";N;s:8:"original";a:2:{i:0;s:6:"[LEFT]";i:1;s:7:"[/LEFT]";}s:8:"children";a:1:{i:0;s:589:"“在过去的40年里,自从火星山谷首次被发现以来,人们的假设是,火星上曾经有河流流过,它们侵蚀并由此产生了所有这些山谷,”该研究的第一作者Anna Grau Galofre指出,“但火星上面拥有数百个山谷,它们看起来各不相同。如果你从卫星上看地球,你会看到许多山谷:有些是由河流形成,有些是由冰川形成,有些是由其他过程形成,每种类型都有独特的形状。火星也很相似,每个山谷看起来也都很不一样,这表明雕刻它们的过程也很多。”";}}i:10;s:2:"
";i:11;a:4:{s:3:"tag";s:4:"left";s:6:"option";N;s:8:"original";a:2:{i:0;s:6:"[LEFT]";i:1;s:7:"[/LEFT]";}s:8:"children";a:1:{i:0;s:376:"为了进行研究,研究人员使用了一种算法来研究山谷的形状并计算出最有可能形成这些山谷的侵蚀过程。据悉,研究小组用这个算法分析了火星上超1万个山谷。结果他们发现,只有一小部分被研究的山谷网络符合预期的地表水侵蚀的模式,而其他许多类似于在冰川下形成的径流通道。";}}i:12;s:2:"
";i:13;a:4:{s:3:"tag";s:6:"center";s:6:"option";N;s:8:"original";a:2:{i:0;s:8:"[CENTER]";i:1;s:9:"[/CENTER]";}s:8:"children";a:1:{i:0;a:4:{s:3:"tag";s:3:"url";s:6:"option";s:66:"https://static.cnbetacdn.com/article/2020/0804/10fb260ea6c7f5a.png";s:8:"original";a:2:{i:0;s:74:"[URL='https://static.cnbetacdn.com/article/2020/0804/10fb260ea6c7f5a.png']";i:1;s:6:"[/URL]";}s:8:"children";a:1:{i:0;a:4:{s:3:"tag";s:3:"img";s:6:"option";N;s:8:"original";a:2:{i:0;s:5:"[IMG]";i:1;s:6:"[/IMG]";}s:8:"children";a:1:{i:0;s:96:"https://rdimg.com/proxy/https://static.cnbetacdn.com/thumb/article/2020/0804/10fb260ea6c7f5a.png";}}}}}}i:14;s:2:"
";i:15;a:4:{s:3:"tag";s:4:"left";s:6:"option";N;s:8:"original";a:2:{i:0;s:6:"[LEFT]";i:1;s:7:"[/LEFT]";}s:8:"children";a:1:{i:0;s:192:"这一设想还有助于填补之前暖湿假说的一个主要情节漏洞。在这些通道形成的时候--大约38亿年前--太阳要安静得多,而火星的气候应该相当寒冷。";}}i:16;s:2:"
";i:17;a:4:{s:3:"tag";s:4:"left";s:6:"option";N;s:8:"original";a:2:{i:0;s:6:"[LEFT]";i:1;s:7:"[/LEFT]";}s:8:"children";a:1:{i:0;s:360:"“气候模型预测,在山谷网形成的时期,火星的古代气候要冷得多,”研究人员Garu Galofre表示,“我们试图把所有因素综合起来从而提出一个从未真正考虑过的假设:水道和山谷网络可以在冰原下形成,作为排水系统的一部分,当水在底部积聚时就会在冰原下自然形成。”";}}i:18;s:2:"
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