求翻译：　现在的研究证明，大约在50亿年前，从太阳星云中分离出一些大大小小的星云团块。它们一边绕太阳旋转，一边自转。在运动过程中，互相碰撞，有些团块彼此结合，由小变大，逐渐成为原始的地球。星云团块碰撞过程中，在引力作用下急剧收缩，加之内部放射性元素蜕变，使原始地球不断受到加热增温；当内部温度达到足够高时，地内的物质包括铁开始熔解。在重力作用下，重的下沉并趋向地心集中，形成地核；轻者上浮，形成地壳。在高温下，内部的水分汽化与气体一起冲出来，飞升入空中。但是由于地心的引力，是什么意思？

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It is now the research has shown that in about 5 billion years ago from the sun, stars in separating a number of small pieces stars. They rotate around the sun, one side one side's rotation. During sports, jostling with each other, and some pieces, the small ones, have gradually become a primitive E

　The present research proved that, probably in 5,000,000,000 years ago, separates some every large or small nebula briquetting from the solar nebula.One side them circles the sun to revolve, at the same time rotation.In the rate process, collides mutually, some briquetting each other union, by the s

　Now, research proved that, in about 5 billion years ago, isolated from a solar nebula Nebula clumps, large and small. They rotate around the Sun, side spin. During exercise, each other, some mass combined with each other, from small to large, emerging as the original Earth. Nebula mass collision pr

　Now, research proved that, in about 5 billion years ago, isolated from a solar nebula Nebula clumps, large and small. They rotate around the Sun, side spin. During exercise and collision, some lumps each other from little larger gradually became the original planet. Nebula mass collision process, u