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Author: R. Kallenbach Publisher: Springer Science & Business Media ISBN: 940171035X Category : Science Languages : en Pages : 501
Book Description
Mars is about one-eighth the mass of the Earth and it may provide an analogue of what the Earth was like when it was at such an early stage of accretion. The fur ther growth of the Earth was sustained by major collisions with planetesimals and planets such as that which resulted in the formation ofthe Earth's moon (Hartmann and Davis, 1975; Cameron and Ward, 1976; Wetherill, 1986; Cameron and Benz, 1991). This late accretionary history, which lasted more than 50 Myr in the case of the Earth (Halliday, 2000a, b), appears to have been shorter and less catastrophic in the case of Mars (Harper et ai. , 1995; Lee and Halliday, 1997). In this article we review the basic differences between the bulk composition of Mars and the Earth and the manner in which this plays into our understanding of the timing and mechanisms of accretion and core formation. We highlight some of the evidence for early cessation of major collisional growth on Mars. Finally, we reevaluate the isotopic evidence that Mars differentiated quickly. Fundamental differences between the composition of Mars and that of other terrestrial planets are apparent from the planet's slightly lower density and from the compositions of Martian meteorites. The low density is partially explicable if there is a greater proportion of more volatile elements.
Author: R. Kallenbach Publisher: Springer Science & Business Media ISBN: 940171035X Category : Science Languages : en Pages : 501
Book Description
Mars is about one-eighth the mass of the Earth and it may provide an analogue of what the Earth was like when it was at such an early stage of accretion. The fur ther growth of the Earth was sustained by major collisions with planetesimals and planets such as that which resulted in the formation ofthe Earth's moon (Hartmann and Davis, 1975; Cameron and Ward, 1976; Wetherill, 1986; Cameron and Benz, 1991). This late accretionary history, which lasted more than 50 Myr in the case of the Earth (Halliday, 2000a, b), appears to have been shorter and less catastrophic in the case of Mars (Harper et ai. , 1995; Lee and Halliday, 1997). In this article we review the basic differences between the bulk composition of Mars and the Earth and the manner in which this plays into our understanding of the timing and mechanisms of accretion and core formation. We highlight some of the evidence for early cessation of major collisional growth on Mars. Finally, we reevaluate the isotopic evidence that Mars differentiated quickly. Fundamental differences between the composition of Mars and that of other terrestrial planets are apparent from the planet's slightly lower density and from the compositions of Martian meteorites. The low density is partially explicable if there is a greater proportion of more volatile elements.
Author: Stephanie C. Werner Publisher: Cuvillier Verlag ISBN: 3736917740 Category : Science Languages : en Pages : 256
Book Description
This thesis was conducted in the framework of the German Research Foundation’s priority program Mars and the Terrestrial Planets as part of the project Chronostratigraphy of Mars. All global stratigraphic and geologic systems for Mars have been based on remote sensing data gathered during the Mariner 9 and Viking mission (Tanaka, 1986; Tanaka et al., 1992a), culminating in three 1:15M–scale geologic maps by Scott and Tanaka (1986); Greeley and Guest (1987); Tanaka and Scott (1987). Generally, most of the surface–forming processes were placed in the early phase of the Martian evolution. Chrono–stratigraphic schemes for Mars are derived from imagery and crater frequencies observed during Mariner 9 and Viking missions, and however, led to a wide range of chronologic systems with no clear consensus on the absolute ages (Hartmann, 1973b; Soderblom et al., 1974; Neukum and Wise, 1976; Hartmann et al., 1981; Neukum and Hiller, 1981; Neukum, 1983; Strom et al., 1992). Missions launched in the late 1990ies, such as Mars Global Surveyor and Mars Odyssey revealed very young volcanic surfaces, correlating in age with Martian meteorite crystallization ages (Hartmann, 1999a). Additionally, global topography (Smith et al., 1999a,b, Mars Orbiter Laser Altimeter) and gravity data (Zuber et al., 2000) as well as the discovery of strong remnant magnetization of the older Martian crust (Acu˜na et al., 1999), implied a more continual and diverse evolution than previously thought.
Author: National Research Council Publisher: National Academies Press ISBN: 0309224640 Category : Science Languages : en Pages : 399
Book Description
In recent years, planetary science has seen a tremendous growth in new knowledge. Deposits of water ice exist at the Moon's poles. Discoveries on the surface of Mars point to an early warm wet climate, and perhaps conditions under which life could have emerged. Liquid methane rain falls on Saturn's moon Titan, creating rivers, lakes, and geologic landscapes with uncanny resemblances to Earth's. Vision and Voyages for Planetary Science in the Decade 2013-2022 surveys the current state of knowledge of the solar system and recommends a suite of planetary science flagship missions for the decade 2013-2022 that could provide a steady stream of important new discoveries about the solar system. Research priorities defined in the report were selected through a rigorous review that included input from five expert panels. NASA's highest priority large mission should be the Mars Astrobiology Explorer Cacher (MAX-C), a mission to Mars that could help determine whether the planet ever supported life and could also help answer questions about its geologic and climatic history. Other projects should include a mission to Jupiter's icy moon Europa and its subsurface ocean, and the Uranus Orbiter and Probe mission to investigate that planet's interior structure, atmosphere, and composition. For medium-size missions, Vision and Voyages for Planetary Science in the Decade 2013-2022 recommends that NASA select two new missions to be included in its New Frontiers program, which explores the solar system with frequent, mid-size spacecraft missions. If NASA cannot stay within budget for any of these proposed flagship projects, it should focus on smaller, less expensive missions first. Vision and Voyages for Planetary Science in the Decade 2013-2022 suggests that the National Science Foundation expand its funding for existing laboratories and establish new facilities as needed. It also recommends that the program enlist the participation of international partners. This report is a vital resource for government agencies supporting space science, the planetary science community, and the public.
Author: Robert M. Haberle Publisher: Cambridge University Press ISBN: 110817938X Category : Science Languages : en Pages : 613
Book Description
Humanity has long been fascinated by the planet Mars. Was its climate ever conducive to life? What is the atmosphere like today and why did it change so dramatically over time? Eleven spacecraft have successfully flown to Mars since the Viking mission of the 1970s and early 1980s. These orbiters, landers and rovers have generated vast amounts of data that now span a Martian decade (roughly eighteen years). This new volume brings together the many new ideas about the atmosphere and climate system that have emerged, including the complex interplay of the volatile and dust cycles, the atmosphere-surface interactions that connect them over time, and the diversity of the planet's environment and its complex history. Including tutorials and explanations of complicated ideas, students, researchers and non-specialists alike are able to use this resource to gain a thorough and up-to-date understanding of this most Earth-like of planetary neighbours.
Author: V. G. Perminov Publisher: Franklin Classics Trade Press ISBN: 9780353299627 Category : History Languages : en Pages : 86
Book Description
This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. To ensure a quality reading experience, this work has been proofread and republished using a format that seamlessly blends the original graphical elements with text in an easy-to-read typeface. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Author: Giuseppe Pezzella Publisher: BoD – Books on Demand ISBN: 1839623624 Category : Science Languages : en Pages : 194
Book Description
More than 50 years after the Mariner 4 flyby on 15 July 1965, Mars still represents the next frontier of space explorations. Of particular focus nowadays is crewed missions to the red planet. Over three sections, this book explores missions to Mars, in situ operations, and human-rated missions. Chapters address elements of design and possible psychological effects related to human-rated missions. The information contained herein will allow for the development of safe and efficient exploration missions to Mars.
Author: William Sheehan Publisher: University of Arizona Press ISBN: 0816532109 Category : History Languages : en Pages : 769
Book Description
A leading historian of astronomy and a leading planetary scientist who works at the forefront of space exploration provide a comprehensive history of the solar system's most alluring planet beyond Earth. William Sheehan and Jim Bell chronicle how ancient watchers of the skies attended to Mars's red color and baffling movements, how three and a half centuries of telescopic observations added vistas and controversies around possible seas and continents and canals, and how the current era of exploration by flyby, orbiter, lander, and rover spacecraft have conjured for us the reality of a world of towering shield volcanoes, vast canyons, ancient dry riverbeds--and even possible evidence of past life. A unique collaboration between two authors on the forefront of Mars explorations, past and future, Discovering Mars provides an ambitious, detailed, and evocative account of humanity's enduring fascination with the Red Planet.
Author: R. Kallenbach
Author: R. Kallenbach
Author: R. Kallenbach
Author: Stephanie C. Werner
Author: National Research Council
Author: Robert M. Haberle
Author: Ray Bradbury
Author: V. G. Perminov
Author: David S. F. Portree
Author: Giuseppe Pezzella
Author: William Sheehan