<h1><img alt="火星" src="http://ichef.bbci.co.uk/news/ws/660/amz/worldservice/live/assets/images/2015/09/28/150928194039_marsslop640.gif" width="640" height="360" style="font-family: inherit; font-size: 14px; font-style: inherit; font-weight: inherit; letter-spacing: inherit; line-height: inherit; color: #bdbdbd; margin: 0px; padding: 0px; vertical-align: baseline; height: auto; max-width: 100%; -webkit-user-select: none; width: 645.781px; display: block; background-color: #111111;" /></h1><div property="articleBody" style="border: 0px; color: #404040; font-family: Helvetica, Arial, STHeiti, 华文黑体, \’Microsoft YaHei\’, 微软雅黑, SimSun, 宋体, \’WenQuanYi Micro Hei\’, sans-serif; font-size: 14px; line-height: 14.5455px; margin: 0px 53.7642px 0px auto; padding: 0px; vertical-align: baseline; background-color: #ffffff;"><figure style="border: 0px; color: inherit; font-style: inherit; font-family: inherit; font-weight: inherit; letter-spacing: inherit; line-height: inherit; margin: 32px -54.2188px 0px 0px; padding: 0px; vertical-align: baseline; clear: both; background-color: #111111;"><figcaption style="border: 0px; color: inherit; font-style: inherit; font-family: inherit; font-weight: inherit; letter-spacing: inherit; line-height: inherit; margin: 0px; padding: 16px; vertical-align: baseline; visibility: visible;"><span style="border: 0px !important; color: inherit; font-style: inherit; font-family: inherit; font-size: 14px; font-weight: inherit; letter-spacing: inherit; line-height: inherit; margin: 0px; padding: 0px !important; vertical-align: baseline; clip: rect(1px 1px 1px 1px); overflow: hidden; position: absolute !important; height: 1px !important; width: 1px !important;">Image caption</span><span style="border: 0px; color: #ececec; font-style: inherit; font-family: inherit; font-size: 0.75rem; font-weight: inherit; letter-spacing: inherit; line-height: 1.33333; margin: 0px; padding: 0px; vertical-align: baseline; display: block;">美国宇航局发现，火星上流动的溪流呈现黑色狭长的痕迹。</span></figcaption></figure><p style="border: 0px; font-style: inherit; font-family: inherit; font-size: 1rem; font-weight: bold; letter-spacing: inherit; line-height: 1.5; margin-top: 28px; padding: 0px; vertical-align: baseline;">美国宇航局表示，他们获得的“至今最强有力证据”显示，火星表面有液态水。</p><p style="border: 0px; font-style: inherit; font-family: inherit; font-size: 1rem; font-weight: inherit; letter-spacing: inherit; line-height: 1.5; margin-top: 18px; padding: 0px; vertical-align: baseline;">从火星勘测轨道飞行器获取的图像显示，在火星陨石坑内和山坡上，均发现了有相当长度的“季节性斜坡纹线”。而这些“季节性斜坡纹线”的成因，应该是盐水在火星表面流动形成的。</p><p style="border: 0px; font-style: inherit; font-family: inherit; font-size: 1rem; font-weight: inherit; letter-spacing: inherit; line-height: 1.5; margin-top: 18px; padding: 0px; vertical-align: baseline;">美国宇航局的科学家在华盛顿发布的最新研究成果发现，火星上存在不同种类的盐，而这些盐的融化，促使了盐水流动。</p><p style="border: 0px; font-style: inherit; font-family: inherit; font-size: 1rem; font-weight: inherit; letter-spacing: inherit; line-height: 1.5; margin-top: 18px; padding: 0px; vertical-align: baseline;">科学家们认为，火星至少在夏季会出现流动的盐水溪。</p><p style="border: 0px; font-style: inherit; font-family: inherit; font-size: 1rem; font-weight: inherit; letter-spacing: inherit; line-height: 1.5; margin-top: 18px; padding: 0px; vertical-align: baseline;">美国宇航局行星科学部门的负责人格林说：“火星不再是我们从前想象的那个干涸的不毛之地。”</p><p style="border: 0px; font-style: inherit; font-family: inherit; font-size: 1rem; font-weight: inherit; letter-spacing: inherit; line-height: 1.5; margin-top: 18px; padding: 0px; vertical-align: baseline;">证据显示，这些由黑色狭长痕迹组成的斜坡纹线似乎在火星最温暖的季节出现，并且变宽蔓延，并在火星一年中的其它月份消失殆尽。</p><p style="border: 0px; font-style: inherit; font-family: inherit; font-size: 1rem; font-weight: inherit; letter-spacing: inherit; line-height: 1.5; margin-top: 18px; padding: 0px; vertical-align: baseline;">但即便是夏季，火星上也极其寒冷。当这些水流痕迹出现时，火星表面的气温也不过刚刚高于华氏零下10度。不过由于水中的盐分，能使火星上的盐水的凝结点比一般水要低。</p><p style="border: 0px; font-style: inherit; font-family: inherit; font-size: 1rem; font-weight: inherit; letter-spacing: inherit; line-height: 1.5; margin-top: 18px; padding: 0px; vertical-align: baseline;">液体水的存在，证明了火星依然处于地质活跃期，从而进一步增强了能孕育简单有机物的可能。</p><p style="border: 0px; font-style: inherit; font-family: inherit; font-size: 1rem; font-weight: inherit; letter-spacing: inherit; line-height: 1.5; margin-top: 18px; padding: 0px; vertical-align: baseline;">同时，这也将使美国宇航局计划的2030年左右人类登陆火星的计划，变得更简单些。</p><p style="border: 0px; font-style: inherit; font-family: inherit; font-size: 1rem; font-weight: inherit; letter-spacing: inherit; line-height: 1.5; margin-top: 18px; padding: 0px; vertical-align: baseline;">美国宇航局的科学家格兰斯菲尔德说，“至于人类能否在火星上生存，现在至少资源已经是现成的了。”</p><p style="border: 0px; font-style: inherit; font-family: inherit; font-size: 1rem; font-weight: inherit; letter-spacing: inherit; line-height: 1.5; margin-top: 18px; padding: 0px; vertical-align: baseline;">火星勘测轨道飞行器自2006年起，就开始围着火星转。</p><p style="border: 0px; font-style: inherit; font-family: inherit; font-size: 1rem; font-weight: inherit; letter-spacing: inherit; line-height: 1.5; margin-top: 18px; padding: 0px; vertical-align: baseline;">格林说，“今天的发现，对于我们了解火星是革命性的。”</p><p style="border: 0px; font-style: inherit; font-family: inherit; font-size: 1rem; font-weight: inherit; letter-spacing: inherit; line-height: 1.5; margin-top: 18px; padding: 0px; vertical-align: baseline;">他说：“我们的探测器还发现，火星上的空气其实很潮湿。”</p></div>