Scientists identify lake of liquid water under surface of Mars

    Source: Xinhua| 2018-07-25 23:41:34|Editor: Mu Xuequan
    Video PlayerClose

    WASHINGTON, July 25 (Xinhua) -- A study published on Wednesday in the journal Science has confirmed that liquid water is present on Mars.

    Italian researchers using radar to probe the planet's polar ice caps have detected a lake of liquid water under the Martian ice, stretching 20 kilometers across, according to the study.

    The detection was made using the Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) instrument on the Mars Express spacecraft, launched by the European Space Agency in 2003.

    MARSIS sent radar pulses that penetrated the surface and ice caps of the planet, then measured how the radio waves propagated and reflected back to the spacecraft, providing scientists with what lies beneath the surface.

    Between May 2012 and December 2015, Roberto Orosei with International Astronomical Union and his Italian colleagues used MARSIS to survey a region called Planum Australe, located in the southern ice cap of Mars.

    They obtained 29 sets of radar samplings, mapping out an area exhibiting a very sharp change in its associated radar signal, about 1.5 kilometers below the surface of the ice and extending sideways about 20 kilometers.

    The radar profile of this area is similar to that of lakes of liquid water found beneath the Antarctic and Greenland ice sheets on Earth, suggesting that there might be a subglacial lake at this location on Mars, according to the study.

    Although the temperature is expected to be below the freezing point of pure water, they suggested that dissolved salts of magnesium, calcium, and sodium, known to be present in Martian rocks, could be dissolved in the water to form a brine.

    Together with the pressure of the overlying ice, this lowers the melting point, allowing the lake to remain liquid, as happens on Earth, according to the study.

    "This is a stunning result that suggests water on Mars is not a temporary trickle like previous discoveries but a persistent body of water that provides the conditions for life for extended periods of time," said Alan Duffy, associate professor from Swinburne University who didn't participate in the study.

    TOP STORIES
    EDITOR’S CHOICE
    MOST VIEWED
    EXPLORE XINHUANET
    010020070750000000000000011105091373481521
    主站蜘蛛池模板: 亚洲国产精品无码成人片久久| 无码人妻丰满熟妇区五十路百度 | haodiaocao几万部精彩视频| 日韩午夜免费论理电影网| 交换交换乱杂烩系列yy| 葫芦里不卖药葫芦娃app| 国产精品对白刺激久久久| 一级毛片高清免费播放| 日韩黄色一级大片| 国产一区二区三区乱码网站| 18成禁人视频免费网站| 婷婷开心深爱五月天播播| 久久夜色精品国产噜噜麻豆 | 男女抽搐动态图| 国产偷国产偷亚洲高清日韩 | 337p欧洲大胆扒开图片| 日韩欧美一区二区三区免费看| 亚洲视屏在线观看| 老司机午夜性生免费福利| 大肉大捧一进一出好爽视频| 久久99精品久久久久久不卡 | 国产寡妇树林野战在线播放| 67194在线看片| 女人18与19毛片免费| 亚洲免费在线看| 男人j桶进女人p无遮挡免费观看| 国产乱人激情H在线观看| 毛片基地看看成人免费| 天天干天天干天天干| 中文字幕欧美日韩| 毛片手机在线观看| 午夜影院在线视频| 青春草国产成人精品久久| 国产精品亚洲欧美大片在线看| 99精品偷自拍| 少妇被又大又粗又爽毛片久久黑人 | 国产在线播放免费| 美女网站在线观看视频免费的| 国模欢欢炮交150视频| xxxxhd93| 成人区人妻精品一区二区不卡视频|