时间:2021-03-08 08:36:13



From the culture section.


Mars Rover Perseverance1 Offers the Best Chance Yet of Finding Signs of Life on Red Planet




After a seven-month and 125 million–mile journey, the Mars 2020 Perseverance Rover will touch down on the red planet today at the expected time of 3:55 p.m. ET. The rover will first have to undergo a difficult landing that NASA refers to as the "seven minutes of terror" due to the number of challenges present and the fact that they occur too fast for radio signals to and from Earth, but it will then set forth2 on what is hoped to be an extraordinary mission: The most comprehensive search yet for signs of life and past presence of water on Mars.


The site chosen for this grand exploration is the Jezero Crater3. Scientists feel this crater with a diameter of approximately 30 miles was once a water-filled lake, and thus the best possible place currently known to examine the ground for past Martian life.


Perseverance will send information in real time, while also collecting rock samples. These samples will be stored on the surface of Mars for a potential future mission to pickup4 and return to Earth. The rover will also be busy photographing and investigating specified5 target areas in the delta6 of Jezero. In addition to all those tasks, Perseverance will test out the Ingenuity7 helicopter drone to see if targeted scouting8 is possible on the planet.


The work Perseverance sets out to do is based on approximately 50 years of past missions, with much of the water-searching research it's using coming from rovers in the late 1990s and early 2000s. The Spirit and Opportunity rover missions, which both started in 2004, were especially instrumental in the understanding of the history of water on Mars. Then 2012's Curiosity confirmed the presence of organic molecules9 that could be the building blocks of life.


"We've built on all of that knowledge to prepare ourselves now with the Perseverance rover," Lori Glaze10, director of NASA's planetary science division, said in a NASA press conference on February 17 that involved several of the program's officials. She said that with Perseverance, NASA looks to "take that next step—to really, actually look for those signs of life."


As with all the prior missions, Perseverance is seen as just another building block for information and discovery—though a large one—to be used to inform future Mars landings and explorations. Perseverance could also lead the way to human exploration of Mars one day. First, though, a lot of logistics has to go right for a safe landing and the hope that all the communications gear works properly.


"This is a very fast-paced, high-stakes operation. It's kind of a race to get it done. And it also involves literally11 hundreds of people having to work together seamlessly. I can tell you, this is not what scientists usually do. Scientists do not usually perform under these kinds of circumstances," Ken12 Farley, Perseverance project scientist at the California Institute of Technology, said at the press conference. "It's a big challenge and I think we are ready."




1 perseverance oMaxH     
  • It may take some perseverance to find the right people.要找到合适的人也许需要有点锲而不舍的精神。
  • Perseverance leads to success.有恒心就能胜利。
2 forth Hzdz2     
  • The wind moved the trees gently back and forth.风吹得树轻轻地来回摇晃。
  • He gave forth a series of works in rapid succession.他很快连续发表了一系列的作品。
3 crater WofzH     
  • With a telescope you can see the huge crater of Ve-suvius.用望远镜你能看到巨大的维苏威火山口。
  • They came to the lip of a dead crater.他们来到了一个死火山口。
4 pickup ANkxA     
  • I would love to trade this car for a pickup truck.我愿意用这辆汽车换一辆小型轻便卡车。||The luck guy is a choice pickup for the girls.那位幸运的男孩是女孩子们想勾搭上的人。
5 specified ZhezwZ     
  • The architect specified oak for the wood trim. 那位建筑师指定用橡木做木饰条。
  • It is generated by some specified means. 这是由某些未加说明的方法产生的。
6 delta gxvxZ     
  • He has been to the delta of the Nile.他曾去过尼罗河三角洲。
  • The Nile divides at its mouth and forms a delta.尼罗河在河口分岔,形成了一个三角洲。
7 ingenuity 77TxM     
  • The boy showed ingenuity in making toys.那个小男孩做玩具很有创造力。
  • I admire your ingenuity and perseverance.我钦佩你的别出心裁和毅力。
8 scouting 8b7324e25eaaa6b714e9a16b4d65d5e8     
  • I have people scouting the hills already. 我已经让人搜过那些山了。
  • Perhaps also from the Gospel it passed into the tradition of scouting. 也许又从《福音书》传入守望的传统。 来自演讲部分
9 molecules 187c25e49d45ad10b2f266c1fa7a8d49     
分子( molecule的名词复数 )
  • The structure of molecules can be seen under an electron microscope. 分子的结构可在电子显微镜下观察到。
  • Inside the reactor the large molecules are cracked into smaller molecules. 在反应堆里,大分子裂变为小分子。
10 glaze glaze     
  • Brush the glaze over the top and sides of the hot cake.在热蛋糕的顶上和周围刷上一层蛋浆。
  • Tang three-color glaze horses are famous for their perfect design and realism.唐三彩上釉马以其造型精美和形态生动而著名。
11 literally 28Wzv     
  • He translated the passage literally.他逐字逐句地翻译这段文字。
  • Sometimes she would not sit down till she was literally faint.有时候,她不走到真正要昏厥了,决不肯坐下来。
12 ken k3WxV     
  • Such things are beyond my ken.我可不懂这些事。
  • Abstract words are beyond the ken of children.抽象的言辞超出小孩所理解的范围.

本文本内容来源于互联网抓取和网友提交,仅供参考,部分栏目没有内容,如果您有更合适的内容,欢迎 点击提交 分享给大家。