We must imagine the early Earth as a mixture of rocky materials, metals, and trapped gases, subject to constant bombardment by smaller planetesimals and without much of an atmosphere.
我们必须想象早期的地球是岩石材料、金属和封闭气的混合物，受到较小的星子的持续轰击，没有多少大气。
Within each orbit, collisions between planetesimals generated immense heat and energy.
在每个轨道内，天体之间的碰撞产生了巨大的热量和能量。
This material gradually coalesced into lumps called planetesimals as gravity and chance smashed smaller pieces together.
随着重力和机会将较小的碎片粉碎在一起，这种物质逐渐聚集成块状，被称为天体。
The "planetesimals" would slowly collide with each other and become more massive.
微型行星会慢慢互相碰撞而增加重量。
While this process had been modeled previously, no one had investigated whether water in planetesimals could produce oceans.
虽然这进程以前已经建模但没有人确定星子(planetesimals)中的水能否产生海洋。
Samples of meteorites that originated from planetesimals indicate that the rocky bodies contained tiny amounts of water.
源于石质天体星子(planetesimals)的陨石样品表明这些石质物体包含微量的水。
But a recent study by an MIT planetary scientist suggests that the planetesimals themselves provided the water that created oceans.
但最近进行的一项麻省理工学院的行星科学家的研究表明，星子(planetesimals)自己提供了形成海洋的水。
Carbonaceous chondrite planetesimals were adsorbed on the mantle surface of the primitive earth, forming primitive carbon-rich areas.
碳质球粒陨石星子被吸积于原始地球上地幔表层，形成原始富碳区。
The accretion of these "planetesimals" is believed to take a few hundred thousand to about twenty million years, with the outermost taking the longest to form.
这些微行星体（planetesimals）的增长会用到几百万年到2千万年的时间，而最外面的部分最晚形成。
Another effect of the first gas giant is that its gravity tends to fling nearby planetesimals to the outer reaches of the system, where they can form new planets.
第一个气态巨行星的另一个功效，是它的重力会把附近的微行星远远抛向系统外侧区域，让它们在该处形成新的世界。
According to planet formation theory, there was a process of building that went on in the early solar system - smaller planetesimals to larger planetary embryos to actual planets.
根据行星形成理论，在太阳系早期，存在一个形成过程，更小的小行星形成稍大的行星胚胎，最终形成现在的行星。
We consider that comets would evolve from the surviving planetesimals in Jupiter-Neptune region. Such planetesimals make of both the rocky and icy materials and may be called ase...
作者认为，彗星是木星到海王星这个区域中的残存星子演变而成的。
Other particles within the disk collided and stuck together to form asteroid-sized objects named as planetesimals, some of which combined to become the asteroids, comets, moons and planets.
其它在盘状星云中的物质相互碰撞合并，形成小行星尺寸的星体，称为“星子”，一些星子相互结合，形成小行星、彗星、卫星和行星。
The idea that trace amounts of water in planetesimals could give rise to vast oceans may seem far-fetched until one considers how small an ocean can be relative to the size and mass of a planet.
星子中微量的水造就了宽阔的海洋这一观点也许看起来不切实际，直到人们认识到相对于一颗行星的质量和体积，浩瀚的海洋是多么的渺小。
The idea that trace amounts of water in planetesimals could give rise to vast oceans may seem far-fetched until one considers how small an ocean can be relative to the size and mass of a planet.
星子中微量的水造就了宽阔的海洋这一观点也许看起来不切实际直到人们认识到相对于一颗行星的质量和体积，浩瀚的海洋是多么的渺小。
Part of such planetesimals entered the asteroid region, drew out most of the matter there, and increased the random velocity of the asteroids that remained, so they could not combine to form a planet.
一部分大星子进入小行星区，拉走了大部分物质，增加了留下的小行星的随机速度，使该区内形成不了大的行星。
Part of such planetesimals entered the asteroid region, drew out most of the matter there, and increased the random velocity of the asteroids that remained, so they could not combine to form a planet.
一部分大星子进入小行星区，拉走了大部分物质，增加了留下的小行星的随机速度，使该区内形成不了大的行星。
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