The Moon (Latin: Luna) is Earth's only natural satellite, and the fifth largest one in the Solar System. The average centre-to-centre distance from the Earth to the Moon is 384,403 km, which is about thirty times the diameter of the Earth. The Moon has a diameter of 3,474 km —slightly more than a quarter that of the Earth and slightly smaller than the east-west distance across the United States. This means that the volume of the Moon is about 2 percent that of Earth. The gravitational pull at its surface is about 17 percent of the Earth's. The Moon makes a complete orbit around the Earth every 27.3 days, and the periodic variations in the geometry of the Earth–Moon–Sun system are responsible for the lunar phases that repeat every 29.5 days.

The Moon is the only celestial body to which humans have traveled and upon which humans have landed. The first artificial object to escape Earth's gravity and pass near the Moon was the Soviet Union's Luna 1, the first artificial object to impact the lunar surface was Luna 2, and the first photographs of the normally occluded far side of the Moon were made by Luna 3, all in 1959. The first spacecraft to perform a successful lunar soft landing was Luna 9, and the first unmanned vehicle to orbit the Moon was Luna 10, both in 1966. The United States (U.S.) Apollo program achieved the only manned missions to date, resulting in six landings between 1969 and 1972. Human exploration of the Moon ceased with the conclusion of the Apollo program, although several countries have announced plans to send people or robotic spacecraft to the Moon.

http://en.wikipedia.org/wiki/Moon

用英语介绍月球

英文诗 :

I gaze on the moon as I tread the drear wild,

每当我漫步荒野凝视明月，

And feel that my mother now thinks of her child,

便想起母亲正惦念着她的孩子，

As she looks on that moon from our own cottage door,

当她从茅舍门口遥望明月时，

Through the woodbine, whose fragrance shall cheer me no more. 穿过冬忍树丛，浓郁树香再也不能安慰我的心灵。

Home! Home! Sweet, sweet Home!

家啊！家啊！甜蜜的家啊！

There's no place like Home! There's no place like Home!

没有地方比得上家！没有地方比得上家！

介绍文章

A galaxy is a huge gravitationally bound system of stars, interstellar gas and dust, plasma, and (possibly) unseen dark matter. Typical galaxies contain 10 million to one trillion (107 to 1012) stars, all orbiting a common center of gravity. In addition to single stars and a tenuous interstellar medium, most galaxies contain a large number of multiple star systems and star clusters as well as various types of nebulae. Most galaxies are several thousand to several hundred thousand light years in diameter and are usually separated from one another by distances on the order of millions of light years.

Earth (often referred to as "the earth") is the third planet in the solar system in terms of distance from the Sun, and the fifth in order of size. It is the largest of its planetary system's terrestrial planets and the only place in the universe known by humans to support life. The Earth was formed around 4.57 billion years ago[1] (see Age of the Earth) and its largest natural satellite, the Moon, was orbiting it shortly thereafter, around 4.533 billion years ago.

The Moon is Earth's only natural satellite. It has no formal name other than "The Moon", although in English it is occasionally called Luna (Latin for moon), or Selene (Greek for moon), to distinguish it from the generic "moon" (natural satellites of other planets are also called moons). Its symbol is a crescent. The terms lunar, selene/seleno-, and -cynthion (from the Lunar deities Selene and Cynthia) refer to the Moon (aposelene, selenocentric, pericynthion, etc.).

译文 :

人才荟萃，是一个巨大的引力约束系统的恒星，星际气体和尘埃，等离子体，并（可能）不出面的暗物质。典型的星系中含有1000万至1万亿韩元（ 107至1012 ）星星，都绕一个共同的重心。此外，以单一的恒星和脆弱的星际介质，大多数星系含有大量的多星系统和星簇以及各种类型的星云。大多数星系几千到几十万光年，直径通常是分开的，又距离对秩序的数百万光年。

地球（通常被称作"地球" ） ，是第三个行星在太阳系中的条款和太阳间距离的，而第五，以便其规模大小。它是世界上最大的行星系统的陆地行星，而且是唯一的地方，在宇宙中已知的人类，以支持生命。地球形成约45.7亿年前[ 1 ] （见时代的地球）和其最大的一颗天然卫星，月球，是绕它此后不久，约45.33亿年前。

月球是地球唯一的天然卫星。它没有任何的正式名称以外的"月亮" ，尽管在英语，它是偶尔被媒体称为月球（拉丁语为月亮） ，或selene （希腊文为月亮） ，以区分它从笼统的"月亮" （天然卫星的其他行星也称为月亮） 。其标志是一个新月。条款月球， selene/seleno- ，并cynthion （从农历诸神selene和辛西娅）是指月亮（ aposelene ， selenocentric ， pericynthion等） 。

月球英文介绍（看要求！！）

作文如下：

The Moon, of course, has been known since prehistoric times. It is the second brightest object in the sky after the Sun.

当然，月球早在史前时代就已为人所知。它是天空中仅次于太阳的第二亮的物体。

As the Moon orbits around the Earth once per month, the angle between the Earth, the Moon and the Sun changeswe see this as the cycle of the Moon's phases.

由于月球每月绕地球一周，地球、月球和太阳之间的角度会发生变化；我们将此视为月球相位的循环。

The time between successive new moons is 29.5 days (709 hours), slightly different from the Moon's orbital period (measured against the stars) since the Earth moves a significant distance in its orbit around the Sun in that time.

连续两次新月之间的间隔时间为29.5天（709小时），与月球的轨道周期（根据恒星测量）略有不同，因为在这段时间内，地球绕太阳运行了相当长的距离。

During their two-and-a-half hour moonwalk, the Apollo crewmen planted the U.S. flag in the soil and received a phone call from President Richard Nixon, who paid tribute to what he called their immense feat.

阿波罗号的宇航员在月球表面漫步了两个半小时,在这期间,他们将美国国旗插入了月球的表面,并且还接到了尼克松总统的来电,对他们作出的壮举表达他的赞赏与谢意.

The Moon is named the moon, also calls 太阴, is Earth's only naturalsatellite, also is to the Earth recent heavenly body.

The Moon is away from the Earth equally is 3.84,401 millionkilometers. This section of distance approximately is terrestrialequator perimeter 10 times. The lunar orbit assumes the ellipse, theperigee mean distance is 363,300 kilometers, the apogee mean distanceis 405,500 kilometers. The Moon diameter is 3,476 kilometers,approximately is the Earth diameter 3,/11. The lunar terrain areaprobably is the earth's surface area 1,/14, is slightly smaller thanthe Asian area. Moon's volume is only equal to the Earth volume 1,/49.The Moon quality approximately is equal to the Earth quality 1/81.3.The Moon matter average density for each cubic centimeter 3.34 grams,is only equal to the Earth density 3/5. On the month surface freelyfalls the body on the gravity acceleration Earth the surface gravityacceleration 1/6. On the Moon escapes the speed approximately for eachsecond 2.4 kilometers, is on the Earth escapes about speed 1/5.

月球 俗称月亮，也称太阴，是地球的唯一的天然卫星，也是离地球最近的天体。

月球 距离地球平均为384,401公里。这段距离约为地球赤道周长的10倍。 月球 轨道呈椭圆形，近地点平均距离为363300公里,远地点平均距离为405500公里。 月球 直径为3476公里,约为地球直径的3/11。 月球 表面面积大约是地球表面面积的1/14，比亚洲面积稍小。 月球 的体积只相当于地球体积的1/49。 月球 质量约等于地球质量的1／81.3。 月球 物质的平均密度为每立方厘米3.34克,只相当于地球密度的3/5。月面上自由落体的重力加速度地球上表面重力加速度的1/6。 月球 上的逃逸速度约为每秒2.4公里,为地球上的逃逸速度的1/5左右。

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