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英语科学地球为什么是圆的

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 our never-thought to ask question for today is: why is the earth round? why not a cube? a cube? no,that's silly. is it? why?because…,because really big things like to be round for some reason. exactly right.and that reason is gravity.


    think of it this way. suppose the earth were a cube. then some points on its surface would be farther away from the center than others. the corners, for example, would be much farther out than the rest.

 

 since gravity works equally on everything, there would be a tendency to pull those uneven places down. the surface would even itself out. the only geometrical object in which every point on the surface is the same distance from the center is a sphere.


    but wait a minute,i've seen pictures of asteroids that have all sorts of crazy shapes.why aren't they round?only because they aren’t big enough for gravity to be a determining factor. if an asteroid were to suddenly become as big as a moon, it would indeed rearrange itself gradually into a sphere.

 
我们今天从未想到的问题是:地球为什么是圆的?为什么不是立方体呢?一个立方体?不,那很愚蠢。是吗?为什么?因为……因为一些重大的事情,因为某种原因,我们喜欢到处转。是啊。这个原因就是重力。
 
 
这样想。假设地球是立方体。然后表面上的一些点会比其他点离中心更远。例如,角落比其他地方要远得多。
 
 
由于重力对所有东西都同样有效,所以有可能把那些凹凸不平的地方拉下来。表面甚至会自己出来。球面上每一点与中心距离相等的唯一几何物体是球体。
 
 
但是且慢,我看到,有各种各样的shapes.why他们不是圆的小行星的照片吗?仅仅是因为它们不够大,重力不能成为决定因素。如果一颗小行星突然变得像月亮那么大,它确实会逐渐地重新排列成一个球体。
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