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But what's really amazing,is this distortions also explain.
但真正神奇的是这类变形也可解释
that mysterious force discovered by Newton so many years ago.
牛顿多年前所发现的神秘作用力
Gravity is the warping of spacetime.
重力就是时空扭曲的结果
Now,curving space and time may sound tricky wrap your head around.and galaxies.
时空扭曲 听来可能玄得让人摸不着头绪 但一点都不玄
Imagine a boat locked on the straight course across the flat surface of a lake.
想象一艘船锁定直线航道 正准备渡过平坦的湖面
A lake that stretches away... Forever.
一座永远无限延伸的湖
The flat lake is like undistorted spacetime.
平坦的湖面就如同未扭曲的时空
Now imagine a giant hole appears beneath the lake.
现在想象湖面下出现一个大洞
and water begins to drain away.
湖水开始排掉
The lake has become distorted,just as spacetime is by a planet.
湖面因此扭曲 就如时空因行星扭曲一样
The effect would be to drag the boat towards the hole...
此作用会将船向洞里拉
so that it begins to curve around it.
因此船开始绕着洞周围航行
Even though the boat is still being driven in a straight line.
即使船本身仍设定在直线航行
And it's exactly that same effect a massive star or planet has.on spacetime.
这种作用就相当于 巨大恒星或行星 对时空产生的作用
It causes spacetime to distort around it,pulling things towards it.
时空会在星体四周产生扭曲 把物体拉向星体
And that's why things fall to earth:Gravity.
因此物体才会坠落地球 就是因为重力
