Nature and History of the Organic Compounds in Comets: An Astrophysical View
Nature and History of the Organic Compounds in Comets: An Astrophysical View
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彗星中有机化合物的性质和历史：天体物理学观点
DOI：
10.1007/978-94-011-3378-4_17
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
A. Delsemme
中科院分区：
文献类型：
--
作者：
A. Delsemme
首先回顾了彗星、碳质球粒陨石、星际分子和颗粒之间的化学相似性。然后，在分子云碎片的坍塌和随后的太阳系形成过程中，冰冷的星际颗粒的演化也随之发生。该范式阐明了两种不同对称的彗星群（奥尔特云和柯伊伯带）的可能起源，并暗示地球上所有碳和水的外源起源。这个起源可以用原行星生长所需要的星子的轨道扩散来解释。
The chemical similarities between comets, carbonaceous chondrites, and interstellar molecules and grains are reviewed first. The evolution of frosty interstellar grains is then followed during the collapse of a molecular cloud fragment and the subsequent formation of the Solar System. The paradigm clarifies the probable origin of the two populations of comets of different symmetry (the Oort Cloud and the Kuiper Belt) and implies an exogenous origin for all carbon and water on Earth. This origin is explained by the orbital diffusion of planetesimals that is required by the growth of protoplanets.