منابع مشابه
Terrestrial Planet Formation
The standard planetesimal model of terrestrial-planet formation is based on astronomical and cosmochemical observations, and the results of laboratory experiments and numerical simulations. In this model, planets grow in a series of stages beginning with the μm-sized dust grains observed in protoplanetary disks. Dust grains readily stick together to form mm-to-cm-sized aggregates, some of which...
متن کاملTerrestrial planet formation.
Advances in our understanding of terrestrial planet formation have come from a multidisciplinary approach. Studies of the ages and compositions of primitive meteorites with compositions similar to the Sun have helped to constrain the nature of the building blocks of planets. This information helps to guide numerical models for the three stages of planet formation from dust to planetesimals (~10...
متن کاملEarth and Terrestrial Planet Formation
The growth and composition of Earth is a direct consequence of planet formation throughout the Solar System. We discuss the known history of the Solar System, the proposed stages of growth and how the early stages of planet formation may be dominated by pebble growth processes. Pebbles are small bodies whose strong interactions with the nebula gas lead to remarkable new accretion mechanisms for...
متن کاملCosmological Constraints on Terrestrial Planet Formation
During a marathon, a runner often does not know which position he is in. His nearest competitors are either so far ahead or so far behind that he doesn’t know where he stands. We earthlings are in a similar situation. We do not yet have a cosmic context for life. We don’t even know if there are other competitors. Approximately 5% of the sun-like stars surveyed possess close-orbiting giant plane...
متن کاملDynamical Models of Terrestrial Planet Formation
We review the problem of the formation of terrestrial planets, with particular emphasis on the interaction of dynamical and geochemical models. The lifetime of gas around stars in the process of formation is limited to a few million years based on astronomical observations, while isotopic dating of meteorites and the Earth-Moon system suggest that perhaps 50-100 million years were required for ...
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ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 2011
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.1013480108