Results 211 to 220 of about 9,274 (264)
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AIP Conference Proceedings, 2004
Some of the astronomical and cosmochemical constraints on the formation of the Sun’s terrestrial planets are reviewed, and the planetesimal theory of planetary accretion is described. Several difficulties remain for this model, especially in its earliest stage, but substantial progress has been made in recent years.
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Some of the astronomical and cosmochemical constraints on the formation of the Sun’s terrestrial planets are reviewed, and the planetesimal theory of planetary accretion is described. Several difficulties remain for this model, especially in its earliest stage, but substantial progress has been made in recent years.
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1977
The terrestrial planets present us with a sequence of widely varying physical environments that determine their chemical and petrologic characteristics.
Robert F. Mueller, Surendra K. Saxena
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The terrestrial planets present us with a sequence of widely varying physical environments that determine their chemical and petrologic characteristics.
Robert F. Mueller, Surendra K. Saxena
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Science, 2014
Recent numerical models may provide a clearer understanding of the forces that shape planetary systems.
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Recent numerical models may provide a clearer understanding of the forces that shape planetary systems.
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Terrestrial Planet Finder coronagraph
SPIE Proceedings, 2003This paper and oral presentation will describe the technology studies, the testbeds, and the architecture studies that will enhance the understanding and viability of a Terrestrial Planet Finder Coronagraph. Topics to be described fall in two categories: technology development and coronagraph mission design. The focus of the paper will be explanation
Virginia G. Ford +6 more
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1995
Mercury, the innermost planet, had been known since ancient times and its phases had been seen with early telescopes. Unfortunately, Mercury is a difficult object to observe, as it is always too low down in the sky when the Sun is below the horizon, and its image is consequently disturbed by the Earth’s atmosphere. As a result, it had proved impossible
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Mercury, the innermost planet, had been known since ancient times and its phases had been seen with early telescopes. Unfortunately, Mercury is a difficult object to observe, as it is always too low down in the sky when the Sun is below the horizon, and its image is consequently disturbed by the Earth’s atmosphere. As a result, it had proved impossible
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2014
The terrestrial planets (Mercury, Venus, Earth, and Mars), also called the inner planets, occupy the region within 1.5 AU from the Sun. They exhibit manifold properties of their surface landforms, geology, interiors, and atmospheric features. The Earth possesses a unique nature; the natural conditions of our neighbors Venus and Mars are completely ...
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The terrestrial planets (Mercury, Venus, Earth, and Mars), also called the inner planets, occupy the region within 1.5 AU from the Sun. They exhibit manifold properties of their surface landforms, geology, interiors, and atmospheric features. The Earth possesses a unique nature; the natural conditions of our neighbors Venus and Mars are completely ...
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Provenance of the terrestrial planets
Geochimica et Cosmochimica Acta, 1994Earlier work on the simultaneous accumulation of the asteroid belt and the terrestrial planets is extended to investigate the relative contribution to the final planets made by material from different heliocentric distances. As before, stochastic variations intrinsic to the accumulation processes lead to a variety of final planetary configurations, but
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Formation of the terrestrial planets
Earth, Moon, and Planets, 1994The early phases of formation in the inner solar system were dominated by collisions and short-range dynamical interactions among planetesimals. But the later phases, which account for most of the differences among planets, are unsure because the dynamics are more subtle. Jupiter’s influence became more important, leading to drastic clearing out of the
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Structure of the Terrestrial Planets
Nature, 1973Recent reviews (cf. Runcorn, 1968; or Cook, 1972, 1975) on the structure of the planets omit reference to the phase-change hypothesis for the nature of the terrestrial core, despite that numerous prior predictions of the theory based on this hypothesis have subsequently been borne out as correct.
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1979
The terrestrial planets possess markedly different intrinsic densities (Table 6.3), implying the existence of corresponding differences in chemical composition. Possible reasons for the compositional differences which were considered in Section 6.5, involved (a) fractionation of metallic iron from silicates in the nebula prior to accretion, and/or (b ...
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The terrestrial planets possess markedly different intrinsic densities (Table 6.3), implying the existence of corresponding differences in chemical composition. Possible reasons for the compositional differences which were considered in Section 6.5, involved (a) fractionation of metallic iron from silicates in the nebula prior to accretion, and/or (b ...
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