嫦娥四号在月球背面着陆_科学技术

嫦娥四号在月球背面着陆

文章来源：未知文章作者：enread 发布时间：2019-01-03 06:44 字体： [大中小]　进入论坛

(单词翻译:双击或拖选)

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.

点击

收听单词发音

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。

上一篇：中国发射6颗云海二号环境科研卫星下一篇：中国研发350km/h高速列车