英语作文关于火星70词并翻译

火星是太阳系九大行星之一，按离太阳由近到远的顺序，火星排在地球的后面，列为第四。它的平均直径为6790公里，约为地球直径的一半。它的密度也比地球小，为3933克/立方厘米（地球为552克/立方厘米）。火星与太阳的平均距离为228000000公里，环绕太阳一圈约相当于地球上的687天。火星上的一天相当于地球上的24小时37分226秒，比地球的一天稍长一点儿。火星有两个小卫星：火卫一和火卫二。火星的自转轴同地球一样，也是倾斜的，同时因为它也具有大气，所以也和地球一样有四季节变化。火星表面的平均大气温度为零下23摄氏度。火星没有可检测出的磁场，连同它密度小的情况，可以认定它没有大型的金属内核

Mars is one of the nine major planets of the solar system, according to from the sun by the near to far order, Mars row behind the earth, as the fourth Its mean diameter is 6790 km, which is about half the diameter of the earth Its density is smaller than the earth, 3933 grams / cubic centimeter (the earth is 552 g / cm3) The average distance to Mars from the sun is 228000000 km, a ring around the sun, the equivalent of about 687 earth days The day on Mars is equivalent to the earth in 24 hours 37 minutes and 226 seconds, slightly longer than the earth one day a little Mars has two small moons Phobos and Deimos The rotation shaft of Mars like the earth, is tilted, and because it also has an atmosphere, so it just like the earth there are four seasonal variation The average air temperature of the surface of Mars to minus 23 degrees celsius Mars has no detectable magnetic field, together with its density is small, can be concluded it had large metal core

1 In 1961, scientists set up gigantic, sensitive apparatus to collect radio waves from the far reaches of space, hoping to discover in them some mathematical pattern indicating that the waves were sent out by other intelligent beings The first attempt failed: but someday the experiment may succeed

What reason is there to think that we may actually detect intelligent life in outer space To begin with, modern theories of the development of stars suggest that almost every star has some sort of family of planets So any star like our wan sun (and there are billions of such stars in the universe) is likely to have a planet situated at such a distance that it would receive about the same amount of radiation as the earth

Furthermore, such a planet would probably have the same general composition as our own; so, allowing a billion years or two — or three — there would be a very good chance for life to develop, if current theories of the origin of life are correct

But intelligent life Life that has reached the stage of being able to sent radio waves out into space in a deliberate pattern Our own planet may have been in existence for five billion years and may have had life on it for two billion, but it is only in the last fifty years that intelligent life capable of sending radio waves into space has lived on earth From this it might seem that even if there were no technical problems involved, the chance of receiving signals from any particular earth-type planet would be extremely small

This does not mean that intelligent life at our level does not exist somewhere There is such an unimaginable number of stars that, even at such miserable odds, it seems certain that there are million of intelligent life forms scattered through space The only trouble is, none may be within hailing distance of us Perhaps none ever will be; perhaps the appalling distances that separate us from our fellow denizens of this universe will forever remain too great to be conquered And yet it is conceivable that someday we may come across one of them or, frighteningly, one of them may come across us What would they be like, these extraterrestrial creatures

2 Tiny Tonga Launches Space Tourism Plan

The tiny poverty-stricken South Pacific state f Tonga has always had serious problems raising money, and so it has always been entrepreneurial It his sold Tongan passports to Hong Kong businessmen; it sold possible satellite broadcasting locations in space; it even officially changed to a different time zone to be the first country to welcome the new millennium1

Now Tonga’s latest money-making venture is a plan to become the world center of space tourism The Tonga government has made an agreement with a US company to allow it to use on of its 170 islands to launch rockets that will take tourists on week-long trips into space at a cost of US$2 million each2

For this price, space tourists receive 60 days’ training in a “resort setting”, followed by the holiday of a lifetime orbiting the Earth3 Two astronaut pilots and four astronaut tourists will make the trip However, skeptics say that these budgets are inadequate Although they predict that space tourism will eventually bring an income of US$10-20 billion a year, they calculate that the budget of $8 million per trip will not be enough to pay for the required technology

Comparison with the current space tourism programme suggests this maths may be accurate To ride the Russian Soyuz (the only tourist ride currently available) costs more than US$20 million per person However, other people, including one important ex-cosmonaut4, criticize the Russian government for raising money in this way, even though it uses the money for the space quota of space missions without achieving anything He also believes that these inexperienced tourists would e a danger in a difficult or life-threatening crisis in space5

3 Astronomy (天文学) is the oldest science known to manThousands of years ago man looked at the stars and wondered about the heavensBut man was limited (限制) by six planets that he could see with his eyes alone

The Greeks (希腊人) studied astronomy over 2,000 years agoThey could see the size, color, and brightness of a starThey could see its place in the skyThey watched the stars move as the seasons changedBut the Greeks had no tools to help themselves study the heavens

Each new tool added to the field of astronomy helped man reach out into space Until there were telescopes (望远镜), man knew a little about the moonHe did not know that the planet called Saturn (土星) had rings around itHis sight was so limited that he could not see all the planetsIn the early 1700s, people thought there were only six planetsPluto (冥王星), the last of nine planets to be discovered, was not seen until 1930

Before the spectroscope (分光镜), man did not know what kind of gases was in the sun or other starsWithout the radiotelescope (射电望远镜), we did not know that radio noises came from far in space

Today, astronomy is a growing scienceWe have learned more in the last fifty years than in the whole history of astronomy