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月球的形成

时间:2010-07-27 21:52    来源:    作者: 点击:
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    The moon used to be a mars-sized asteroid which incidentally collided with the Earth 4-4.5 billion years ago. Most of the mars-sized asteroid's debris joined the Earth through gravity. The leftover debris was charged into orbit with the Earth in a disk-like formation. Part of the Earth's mantle was also launched into orbit because of the collision. This whole process increased the Earth's mass dramatically. Over a long period of time, the debris that were orbiting the Earth, started to hit each other and clump together. This turned out to be our moon in the end that orbits us nowadays, although practically the same size it used to be much closer to the Earth.

    The moon happens to cause tides in the Earth by gravity, which help us in transportation, energy, and prevent large bodies of water to freeze, like lakes, etc. Although, we would still get tides without the moon, since we still have the Sun, it would not be much. Only 12 hours a day would we get different tides in one place, but since we barely have a delay time for different tides, which is at Quarter Moons every month. Also, the Sun is only 46% effective in creating tides on Earth, compared to the moon. So the moon contributes in creating tides twice as much as the Sun.

    The Moon also helps us obtain light even when we are not facing the Sun (this means nighttime), by reflecting the light of the Sun back to Earth.

    One important factor about the moon is that it locks our planet into a stable rotation, and position with the sun. Resulting in the equator always facing the Sun to give balance to the temperature on the Earth. Planets that don't have large moons, rotate without stability. Where sometimes, the poles face the Sun and the equators do not. If that happens, the planet spin on the axis, of which the top is at the closest point to the Sun. That point will reach extreme high temperatures, since it constantly faces the Sun, whereas the opposite pole will be extremely cold half of the year. These extremes will exterminate all complex life on the planet. Due to drag between the Sun and the Earth, our moon is moving far from us, although slowly but surely. After we lose our moon, the Earth will not remain its stable position, sooner or later it will tip and all complex life will die. Life would still be possible, when the Earth returns back to it original position, life will start afresh. Although it is noted that since it will not have its stability, the Earth will wobble too, destroying life again and life will start anew every time, in a cycle.

    月球曾是一个体积与火星相称的星体。而在40-45亿年前,它与地球产生了巨年夜的撞击。其年夜部分撞击碎片因受引力影响,被地球合并,地球的质量因而年夜年夜增进。余下的,则是一个似圆盘状的星体,并环绕地球扭转。这次撞击中,地球部分表层亦被激射出去,在太空中绕地球扭转。这些撞击碎片,经年累月之后,徐徐相互粘合到一路,形成一个星体,而这个星体,便是本日我们所熟知的月球了。而它的体积,在撞击前曾经和地球相差无几。

    月球经由过程自身的引力,给地球带来潮汐。这使得我们在运输、能源方面年夜受其益;且湖泊等年夜型水体也是以不致被冰冻。诚然,没有玉轮,地球也会因太阳而有潮汐,可是,要小很多了。一天每12个小时,我们便可在同一个处所看到差此外潮汐。每个月,上弦月或下弦月时,差此外潮汐城市准期而至。另外,太阳在引起潮汐方面,其效用只有月球的46%.换言之,月球孝敬的潮汐,有太阳的两倍之多了。

    月球对地球至紧急的,是使地球的自转得以不变,而对太阳的位置亦贯串毗邻恒常。是以,赤道总能正对太阳,地球的温度便能到达均衡。一个恒星,如没有体积契合的卫星,那么它的自转会极不不变。这样的行星,偶尔会以南或北极面对太阳,而非赤道。试想要是行星以南或北极正对太阳的转轴自转,那么一极会因始终正对太阳而温度极高,而另一极则会在半年中十分严寒。云云极真个温差,会导致地球上的高级生命难以保留。因为太阳和地球之间有牵引力,月球正离我们一直远去,只是历程非凡很是迟缓。一旦当我们失踪去月球,地球将难以贯串毗邻自转轴的不变,地极日夕会偏向太阳,高级生命将不复存在。当地球规复的契合位置,生命又将更生。而因为地球的位置不是恒久不变的,生命又会被摧毁。生命的生灭会一直上演




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