地球下坠要多久呢？
I wonder if I shall fall right through the earth!
我想知道我会不会正好穿过地球掉下去！
If the Sun was at the center of the universe, things would fall toward the Sun and away from the Earth, which of course they didn't.
如果太阳在宇宙的中心，物体就会离开地球向太阳落去，但事实显然没有。
Why things don't fall off the earth is explained in the text.
为什么东西不掉离地球课文里已有说明。
This makes the satellite fall down to the earth.
这使得卫星坠落到地球上。
Computer simulations of this impact show that both of the objects would melt in the impact and the dense core of the impactor would fall as molten rock into the liquefied iron core of Earth.
对这次撞击的计算机模拟显示，这两个物体都会在撞击中熔化，而撞击者稠密的核心会以熔融岩石的形式落入地球的液化铁芯中。
Afraid that in her unclear state of mind she might fall off the rock to her death, Grant climbed on all fours up a tight, narrow path by digging into the earth with his fingers and feet until he reached Paula.
担心她在神志不清的状态下会从岩石上掉下来摔死，格兰特手脚插入泥土，四肢并用地沿着一条狭窄的小路往上爬，一直爬到宝拉身边。
Why do stones fall because they do strive to reach the center of the earth.
为什么石块会下落呢，仅仅是因为要到达地球的中心。
That sort of thing comes easy to any folk not brought firmly back to earth once a year by a fall.
而这样做对于不能一年一度被秋天坚实地带回到人世中来的人并不困难。
Well, the earth is going to fall towards the apple — So the force on the earth is the mass of the earth times the acceleration of the earth.
地球也会坠向苹果-，因此地球上的力与地球的质量相等，再乘以地球的加速度。
Sometimes the moon doesn’t completely fall into the shadow of the Earth, however.
有时候，月亮并没有完全进入地球的影子，这时候，只有一部分月亮变暗，我们将看到偏食。
They suggest that during its orbit it would regularly enter the Oort cloud, jostling the orbits of many comets there and causing some to fall toward Earth.
他们提出，在这颗行星的轨道上，它会定期地进入奥特云，扰乱那里很多彗星的轨道，并且使得其中一些彗星掉落到去往地球的方向上。
According to the myth, the sailors believed after sailing for weeks without spotting land, they would fall off the face of the Earth.
根据传说，船员们认为如果一直航行数周而见不到陆地，他们将会从地球表面坠落。
It shares this with a number of smaller asteroids whose orbits suggest they were spalled off in the collision, and with about 5% of the meteorites which fall to Earth.
灶神星和许多更小的小行星共同具有这种特征谱。这些更小行星的轨道表明它们是那次碰撞中剥落下来的，而其中大约5%的陨石落到了地球上。
If it rains or snows, the radioactive elements it can fall to earth more quickly.
如果下雨或下雪，放射性元素就能以更快速度降落至地面。
The bridal of the earth and sky - the dew shall weep thy fall to-night; For thou must die.
天地间完美的匹配-今宵的露珠儿将为你的消逝而落泪；因为你必须离去。
Even though asteroids of roughly that size fall to Earth a few times a year, the NEO Program telescopes often miss them because the survey is tuned to search for larger, more distant rocks.
即使每年都有几颗类似体积的小行星飞临地球，近地天体项目的望远镜也时常观测不到，因为巡天望远镜是为寻找较大，较远的太空岩石。
These oxides are released into the atmosphere and they can fall back to earth as acid rain.
这些氧化物会被排进大气，然后会以酸雨的形式降回地面。
Using large deployable surfaces to increase the drag on these objects so they fall to Earth rapidly is one possible solution to the space litter problem.
为了解决太空垃圾的问题，科学家们正考虑在这些垃圾的表面安装风帆，增加空气阻力，使它们更快地坠毁在地面上。
It will eventually fall to the earth after a few years.
几年之后，尘埃将最终漂落在地球上。
I have packed inadequately, assuming that early fall would be much warmer in Germany than in New York, which I always think of, irrationally, as the coldest place on earth from October to late March.
我穿的很单薄，在德国至少比纽约温暖得多，我常常这样思索，——至少我没有发狂，现在的天气，就像十月或是三月晚些时候的天气一样。
Anyone proposing a strategy that fails to take account of these combined crunches is about to fall to earth with a bump.
任何人提出解决危机的策略，如果不考虑这些组合的危机都将受到重创。
Day and night would each be exactly 12 hours long on a spring or fall equinox only if the sun were a single point of light and Earth had no atmosphere.
如果想要昼夜在春秋分日达到精确地12小时等长，除非太阳是个单点光源或者地球上没有大气层。
Day and night would each be exactly 12 hours long on a spring or fall equinox only if the sun were a single point of light and Earth had no atmosphere.
如果想要昼夜在春秋分日达到精确地12小时等长，除非太阳是个单点光源或者地球上没有大气层。
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