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美国火星探测车将探索古生命

作者: 发布于:2019-09-06 13:49
NASA's Mars 2020 rover, its latest robotic mission to the Red Planet, will include technology to explore ancient life on Mars, according to NASA's Jet Propulsion Laboratory on Wednesday.   美国宇航局送往火星的最新型探测车将加入可以探索火星古生命的技术。
    The science goal of the Mars 2020 rover is to look for signs of ancient life. It will be the first spacecraft to collect samples of the Martian surface, caching them in tubes that could be returned to Earth on a future mission.   The atmosphere on Mars is mostly carbon dioxide and extremely thin, about 100 times less dense1 than the Earth's, with no breathable oxygen. There's no water on the surface and the landscape is freezing, with no protection from the Sun's radiation or from passing dust storms.   The keys to survival will be technology, research and testing, said JPL, adding Mars 2020 will help on all those fronts.   When it is launched in July 2020, the spacecraft will carry the latest scientific and engineering tools.   Before touchdown on Mars, sensors2 in the spacecraft's aeroshell, the capsule that encloses the rover, will study how it heats up and performs during atmospheric3 entry.   The rover has a guidance system that will take a step toward safer landings. Called Terrain4 Relative Navigation, this new system figures out where the spacecraft is headed by taking camera images during descent and matching landmarks5 in them to a preloaded map.   If the spacecraft drifts toward dangerous terrain, it will divert to a safer landing target.
1 dense      a.密集的,稠密的,浓密的;密度大的 参考环亚ag8866官网例句:
  • The general ambushed his troops in the dense woods. 将军把部队埋伏在浓密的树林里。
  • The path was completely covered by the dense foliage. 小路被树叶厚厚地盖了一层。
2 sensors      n.传感器,灵敏元件( sensor的名词复数 ) 参考例句:
  • There were more than 2000 sensors here. 这里装有两千多个灵敏元件。 来自《简明英汉词典》
  • Significant changes have been noted where sensors were exposed to trichloride. 当传感器暴露在三氯化物中时,有很大变化。 来自辞典例句
3 atmospheric      adj.大气的,空气的;大气层的;大气所引起的 参考例句:
  • Sea surface temperatures and atmospheric circulation are strongly coupled.海洋表面温度与大气环流是密切相关的。
  • Clouds return radiant energy to the surface primarily via the atmospheric window.云主要通过大气窗区向地表辐射能量。
4 terrain      n.地面,地形,地图 参考例句:
  • He had made a detailed study of the terrain.他对地形作了缜密的研究。
  • He knows the terrain of this locality like the back of his hand.他对这一带的地形了如指掌。
5 landmarks      n.陆标( landmark的名词复数 );目标;(标志重要阶段的)里程碑 ~ (in sth);有历史意义的建筑物(或遗址) 参考例句:
  • The book stands out as one of the notable landmarks in the progress of modern science. 这部著作是现代科学发展史上著名的里程碑之一。 来自《现代汉英综合大词典》
  • The baby was one of the big landmarks in our relationship. 孩子的出世是我们俩关系中的一个重要转折点。 来自辞典例句


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