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。

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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。

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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。

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Trappist (TRAnsiting Planets and PlanetesImals Small Telescope) will study exoplanets by measuring at high precision the "brightness dips" that can be caused by objects transiting (passing in front of) their parent star.

BBC: New robotic telescope in Chile set for planet hunt