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嫦娥四号在月球背面着陆

文章来源: 更新时间:2019-05-17

China's Chang'e-4 probe touched down on the far side of the moon Thursday, becoming the first spacecraft soft-landing on the moon's uncharted side that is never visible from Earth.   中国嫦娥四号探测器于周四在月球背面着陆,成为在月球背面软着陆的第一台航天器。   The probe comprised of a lander and a rover, touched down at the preselected landing area at 177.6 degrees east longitude1 and 45.5 degrees south latitude2 on the far side of the moon at 10:26 a.m. (Beijing Time), the China National Space Administration (CNSA) announced.   With the communication assistance of the relay satellite Queqiao, meaning Magpie3 Bridge, the probe sent back the first-ever close-up photograph of the moon's far side, opening a new chapter in lunar exploration.   After the Beijing Aerospace4 Control Center sent an order at 10:15 a.m., the Chang'e-4 probe, launched on Dec. 8, 2018, began to descend5 from 15 km above the moon with a variable thrust engine being ignited, said CNSA.   The Chang'e-4's relative velocity6 to the moon was lowered from 1.7 km per second to close to zero, and the probe's attitude was adjusted at about 6 to 8 km above the lunar surface.   At 100 meters up, the probe hovered7 to identify obstacles and measured the slopes on the surface. After avoiding the obstacles, it selected a relatively8 flat area and descended9 vertically10 and slowly.   Then the probe landed in the Von Karman Crater11 in the South Pole-Aitken Basin.   During the descending12 process, a camera on the probe took photos of the landing area.
1 longitude      n.经线,经度 参考例句:
  • The city is at longitude 21°east.这个城市位于东经21度。
  • He noted the latitude and longitude,then made a mark on the admiralty chart.他记下纬度和经度,然后在航海图上做了个标记。
2 latitude      n.纬度,行动或言论的自由(范围),(pl.)地区 参考例句:
  • The latitude of the island is 20 degrees south.该岛的纬度是南纬20度。
  • The two cities are at approximately the same latitude.这两个城市差不多位于同一纬度上。
3 magpie      n.喜欢收藏物品的人,喜鹊,饶舌者 参考例句:
  • Now and then a magpie would call.不时有喜鹊的叫声。
  • This young man is really a magpie.这个年轻人真是饶舌。
4 aerospace      adj.航空的,宇宙航行的 参考例句:
  • The world's entire aerospace industry is feeling the chill winds of recession.全世界的航空航天工业都感受到了经济衰退的寒意。
  • Edward Murphy was an aerospace engineer for the US Army.爱德华·墨菲是一名美军的航宇工程师。
5 descend      vt./vi.传下来,下来,下降 参考例句:
  • I hope the grace of God would descend on me.我期望上帝的恩惠。
  • We're not going to descend to such methods.我们不会沦落到使用这种手段。
6 velocity      n.速度,速率 参考例句:
  • 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。
7 hovered      鸟( hover的过去式和过去分词 ); 靠近(某事物); (人)徘徊; 犹豫 参考例句:
  • A hawk hovered over the hill. 一只鹰在小山的上空翱翔。
  • A hawk hovered in the blue sky. 一只老鹰在蓝色的天空中翱翔。
8 relatively      adv.比较...地,相对地 参考例句:
  • The rabbit is a relatively recent introduction in Australia.兔子是相对较新引入澳大利亚的物种。
  • The operation was relatively painless.手术相对来说不痛。
9 descended      a.为...后裔的,出身于...的 参考例句:
  • A mood of melancholy descended on us. 一种悲伤的情绪袭上我们的心头。
  • The path descended the hill in a series of zigzags. 小路呈连续的之字形顺着山坡蜿蜒而下。
10 vertically      adv.垂直地 参考例句:
  • Line the pages for the graph both horizontally and vertically.在这几页上同时画上横线和竖线,以便制作图表。
  • The human brain is divided vertically down the middle into two hemispheres.人脑从中央垂直地分为两半球。
11 crater      n.火山口,弹坑 参考例句:
  • 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。
12 descending      n. 下行 adj. 下降的 参考例句:
  • The results are expressed in descending numerical order . 结果按数字降序列出。
  • The climbers stopped to orient themselves before descending the mountain. 登山者先停下来确定所在的位置,然后再下山。

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