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A population of comets in the main asteroid belt

机译:主要小行星带中的彗星种群

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Comets are icy bodies that sublimate and become active when close to the Sun. They are believed to-originate in two cold reservoirs beyond the orbit of Neptune: the Kuiper Belt (equilibrium temperatures of similar to 40 kelvin) and the Oort Cloud (similar to 10 kelvin). We present optical data showing the existence of a population of comets originating in a third reservoir: the main asteroid belt. The main-belt comets are unlike the Kuiper Belt and Oort Cloud comets in that they likely formed where they currently reside and may be collisionally activated. The existence of the mainbelt comets lends new support to the idea that main-belt objects could be a major source of terrestrial water.
机译:彗星是冰冷的物体,在靠近太阳时会升华并变得活跃。据信它们起源于海王星轨道以外的两个冷库:柯伊伯带(平衡温度约40开尔文)和奥尔特云(约10开尔文)。我们提供的光学数据表明存在于第三个水库:主小行星带中的彗星种群存在。主带状彗星与柯伊伯带和奥尔特云状彗星的不同之处在于,它们很可能在当前居住的地方形成并可能被碰撞激活。主带彗星的存在为主带物体可能是陆地水的主要来源提供了新的支持。

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