谁告诉我几个英语的宇宙小知识

[谁推荐几个搞笑的网名]查无此人” “老**庄**孙**子” “帅得很内疚” “中暑山庄” “一脸的美人痣” “今夜酷寒不宜裸奔” “小泉，纯一狼” “梅川酷子” “摩托骡拉” “本人纯属虚构” “当Do...+阅读

谁告诉我几个英语的宇宙小知识

Cosmic Radiation Cosmic radiation and air travel Cosmic radiation is part of our natural environment, and we are constantly exposed to a certain amount of ionizing radiation. Radiation originating from outer space and the sun is called cosmic radiation and contributes about 13% of the background radiation level on Earth (a greater part is due to radon). Special features of cosmic radiation Cosmic radiation is a complex mixture of charged and neutral particles, some of them generated when primary particles from space interact with the earth's atmosphere. This complexity also leads to difficulties in measuring radiation doses from cosmic radiation, but physicists have developed sophisticated approaches to deal with this situation. For the human exposure situation one feature of cosmic radiation is of particular importance: a large percentage of the effective radiation dose from cosmic radiation is due to neutrons of different energy levels. Neutrons are subatomic particles which - when compared to X-rays or Gamma rays - cause more biological damage per dose unit. Exposure during flying As a rule, cosmic radiation levels rise with increasing altitude (up to about 20 km above ground). The actual radiation level is influenced by a number of factors, most importantly through the shielding provided by the earth's atmosphere. The overall effect for flight crew and travellers is an increased radiation exposure during flights as compared to staying on the ground. Flight crew passes up to 1000 hours per year on board of flying planes, which leads to annual effective radiation doses in the range of 2 to 5 milliSievert (mSv) for most crew. Occasional travellers obtain a fraction of this value through less frequent leisure or occupational flights. In comparison, the natural background radiation amounts to 2 to 3 mSv per year at most geographical locations worldwide. Cosmic radiation and health A series of studies concerning health issues associated with cosmic radiation has been conducted in the past few years. The WHO Information Sheet summarizes the current knowledge and ongoing research activities, and gives target-group specific recommendations on actions concerning cosmic radiation. 这绝对是关于宇宙的，采纳我的啊

现在紧急需要一篇关于太空方面的英文短文！

这是一篇关于太空垃圾的文章，希望对您有用.In spite of the rapid growth of economy and technology, our environment has been seriously polluted. It is mainly because there has been a vast amount of trash. The reasons why we have more and more trash are as follows. First, the number of people who produce trash is on the increase. Second, we do not have enough space to have garbage dumped. Third, a lot of rubbish which can be reused than thrown away by people. Here are several ways we can use to help decrease the amount of trash. First, we should get the public re-educated and let them know the fact that trash pollutes our environment and is harmful to our health. Second, we suggest our government enact strict laws to crack down upon people who litter garbage here and there. Third, we can call on our neighbors to reuse as many things as they have used as possible. Thus, we can have a cleaner environment to live in...

关于地球宇宙恒星的知识要英文

地球的 The earth is from inside to outside our solar system, but also the third planet in the solar system, quality and density biggest diameter of earth-like planets. It also is often called the world. A word of English Earth Earth from Old English and Germanic. Earth has 44 ~ 46 billion years old, and have a single natural satellite the moon with 30 days surrounding earth, and the earth the cycle of rotating the cycle of nearly 24 hours in one year cycle rotation and revolution around the sun. Disney set the documentary.

用英语说明有关月球的知识

A Temperature Change on the Moon

Astronomers can tell just how hot the surface of the moon gets. The side of the moon toward the sun gets two degrees hotter than boiling water. The night side reaches 243 degrees below zero.

In an eclipse, the earth's shadow falls on the moon. Then the moon's temperature may drop 300 degrees in a very short time.

A temperature change like this cannot happen on the earth. Why does it happen on the moon? Astronomers think that the surface of the moon is dust. On the earth, rocks store heat from the sun. When the sun goes down, the rocks stay warm. But the dust of the moon cannot store heat. So when the moon gets dark, the heat escapes quickly. The moon gets very cold.