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天文一号成功发射,开启中国自主火星探测第一步

文章来源:admin    时间:2020-07-27

  周四我国在海南岛文昌航天发射场,用长征五号遥四运载火箭将我国初次火星勘探使命“天问一号”勘探器发射升空,敞开了我国自主打开行星勘探的第一步。
China launched its first independent Mars mission on Thursday from the Wenchang Space Launch Center in Hainan province, marking the start of the nation's planetary exploration program.   As the launch sequence started at 12:41 pm, 10 engines at the bottom of the Long March 5 carrier rocket's first core stage and four boosters roared to life, generating a combined thrust of more than 1,000 metric tons to lift the gigantic vehicle and its payload, the Tianwen 1 robotic probe, into a bright blue sky dotted with white clouds from the coastal1 launch complex in Wenchang.   The 57-meter rocket, the strongest and most technologically2 sophisticated in China's launch vehicle family, flew for more than half an hour before placing the spacecraft on an Earth-Mars transfer trajectory3. The flight set a speed record for the country's rocket fleet as it surpassed the escape velocity4 of 11.2 kilometers per second required to get away from Earth's gravitational pull.   If everything goes according to schedule, the 5-metric ton Tianwen 1, which consists of two major parts — an orbiter and a landing capsule — will travel more than 400 million kilometers in nearly seven months before getting captured by the Martian gravitational field, the China National Space Administration said.   Several mid-course and deep-space correction maneuvers5 will be made during the spaceflight to make sure the probe is precisely6 aimed at the red planet.   After the probe enters Mars orbit, it will revolve7 around the planet for two to three months to investigate the landing capsule's preset landing site before descending8 to release the landing capsule, which will gradually drop through the Martian atmosphere.   During the entry, descent and landing process, the capsule will first use a heat shield to decelerate, which means the craft will rely on aerodynamic drag to slow itself down. It will then deploy9 a parachute to further reduce the speed and drop its heat shield and later its back shell. In the next step, the capsule will drop the parachute and ignite its retrorockets.   When the craft reaches about 100 meters above the surface, it will suspend the descent and spend some time observing and analyzing10 the selected landing point to check for obstacles like rocks. With a positive result, the lander will continue descending until the last moment, when the retrorockets will be shut down, allowing it to touch down steadily11 on Martian soil, according to the administration.   Meanwhile, the orbiter will continue circling the red planet for mapping and measurement tasks with seven scientific apparatus12, including a high-resolution imager and a magnetometer. It will also relay signals between ground control and the rover.    
1 coastal      adj.海岸的,滨海的,沿岸的 参阅例句:
  • The ocean waves are slowly eating away the coastal rocks.大海的波涛渐渐地腐蚀着岸边的岩石。
  • This country will fortify the coastal areas.该国将加强滨海地区的防护。
2 technologically      ad.技能上地 参阅例句:
  • Shanghai is a technologically advanced city. 上海是我国的一个技能先进的城市。
  • Many senior managers are technologically illiterate. 许多高档司理都对技能知之甚少。
3 trajectory      n.弹道,轨迹 参阅例句:
  • It is not difficult to sketch the subsequent trajectory.很简单描绘出它们终究的轨迹。
  • The path followed by a projectile is called its trajectory.抛物体所循的途径称为它的轨迹。
4 velocity      n.速度,速率 参阅例句:
  • Einstein's theory links energy with mass and velocity of light.爱因斯坦的理论把能量同质量和光速联系起来。
  • The velocity of light is about 300000 kilometres per second.光速约为每秒300000公里。
5 maneuvers      n.战略,策略,把戏( maneuver的名词复数 ) 参阅例句:
  • He suspected at once that she had been spying upon his maneuvers. 他马上猜想到,她现已侦查到他的举动。 来自辞典例句
  • Maneuvers in Guizhou occupied the Reds for four months. 贵州境内的作战占了赤军四个月的时刻。 来自辞典例句
6 precisely      adv.刚好,正好,精确地,详尽地 参阅例句:
  • It's precisely that sort of slick sales-talk that I mistrust.我不相信的正是那种油嘴滑舌的推销宣扬。
  • The man adjusted very precisely.那个人调得很准。
7 revolve      vi.(使)旋转;循环呈现 参阅例句:
  • The planets revolve around the sun.行星绕着太阳工作。
  • The wheels began to revolve slowly.车轮开端渐渐滚动。
8 descending      n. 下行 adj. 下降的 参阅例句:
  • The results are expressed in descending numerical order . 成果按数字降序列出。
  • The climbers stopped to orient themselves before descending the mountain. 登山者先停下来确认地点的方位,然后再下山。
9 deploy      v.(军)散开成战役队形,安置,打开 参阅例句:
  • The infantry began to deploy at dawn.步卒黎明时开端进入战役方位。
  • The president said he had no intention of deploying ground troops.总总称并不计划布置地面部队。
10 analyzing      v.剖析;剖析( analyze的现在分词 );分化;解说;对…进行心思剖析n.剖析 参阅例句:
  • Analyzing the date of some socialist countries presents even greater problem s. 剖析某些社会主义国家的统计数据,暴露出的问题乃至更大。 来自辞典例句
  • He undoubtedly was not far off the mark in analyzing its predictions. 当然,他对其猜测所作的剖析倒也八九不离十。 来自辞典例句
11 steadily      adv.稳定地;不变地;继续地 参阅例句:
  • The scope of man's use of natural resources will steadily grow.人类使用自然资源的广度将日益扩展。
  • Our educational reform was steadily led onto the correct path.咱们的教学改革渐渐上轨迹了。
12 apparatus      n.设备,器械;用具,设备 参阅例句:
  • The school's audio apparatus includes films and records.校园的视听设备包含放映机和录音机。
  • They had a very refined apparatus.他们有一套十分精巧的设备。

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