When you look up into the sky at night, have you ever felt t
来源:学生作业帮 编辑:搜搜考试网作业帮 分类:英语作业 时间:2024/06/10 20:20:38
When you look up into the sky at night, have you ever felt that your eyes are playing tricks on (捉弄) you? It seems that the stars are moving all the time. Actually, there is nothing wrong with your eyes. This twinkling effect is called scintillation (交光). Scintillation happens because of air movements in the earth’s atmosphere (大气). Light is “bent (弯曲的)” when it travels through different parts of the earth’s atmosphere. As the air in the earth’s atmosphere is moving all the time, the light from the stars looks as if it is moving too. The same thing also happens to things on the ground. On a very hot and shiny day, if you look at the road, the image in the distance is not clear and things move slightly. You can also see the same effect if you drop a rock into water. The rock appears a little unclear under the moving water. This twinkling effect causes a lot of problems for astronomers (天文学家) since they cannot observe the stars clearly. A telescope (望远镜) was sent into space so that the air movements in the atmosphere could be avoided (避免). It took a long time to build the space telescope but finally in 1990, a huge space telescope called the Hubble Space Telescope was successfully sent into space. Since then, astronomers have many important observations that have helped people understand space better. 根据短文内容,选择最佳选项。 (10分) 小题1:What happens to the light from the stars we see when the air in the earth’s atmosphere is moving?
|
小题1:C
小题2:B
小题3:B
小题4:A
小题5:D
When you look up into the sky at night, have you ever felt t
when you look into the sky at night,you can see a large numb
When you look up and have a look at the sky belongs to us,if
When you look up into the blue sky YOU will find a great big
英语翻译When you look at the sky at night,the moon looks bigger
when night comes, you look to the sky,
翻译On a clear night we can look up at the sky and see into sp
when you look up to the sky 是什么歌
look up into the sky
英语翻译Please look up and have a look at the sky once belongs t
英语翻译Have you ever felt lost when you red signs like"The slip
If you look at the sky one night and see something moving an