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  • Life and Medical Sciences  (1,435)
  • LUNAR AND PLANETARY EXPLORATION  (533)
  • 1985-1989  (1,968)
  • 1980-1984
  • 1989  (1,968)
Collection
Publisher
Years
  • 1985-1989  (1,968)
  • 1980-1984
Year
  • 1
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    Publication Date: 2019-08-28
    Description: This video describes Voyager 2's encounter with Neptune. Computer animation and actual data convey Voyager's discoveries such as turbulent storms and dark spots in Neptune's atmosphere, six new moons, Neptune's three rings, and the presence of frozen methane on Triton, as researchers at NASA's Jet Propulsion Laboratory describe Voyager's achievements.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: ASR-251 , NASA-TM-109361 , NONP-NASA-VT-94-198208
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  • 2
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    In:  Other Sources
    Publication Date: 2019-08-28
    Description: Issues, problems, and potential solutions of the lunar and Mars missions which will be undertaken in the first decade of the next century are discussed. Arguments are made for the feasibility and usefulness of a lunar base, and an evolutionary approach to a manned Mars mission involving a preliminary mission to Phobos is outlined. The Shuttle Z concept for both moon and Mars missions which involves a dual use of a spacecraft transfer stage operating also as a booster third stage is defined.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Spaceflight (ISSN 0038-6340); 31; 297-302
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  • 3
    Publication Date: 2019-08-28
    Description: Planetary maps being produced today will represent views of the solar system for many decades to come. The primary objective of the planetary cartography program is to produce the most complete and accurate maps from hundreds of thousands of planetary images in support of scientific studies and future missions. Here, the utilization of digital techniques and digital bases in response to recent advances in computer technology are emphasized.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-4092 , NAS 1.15:4092
    Format: application/pdf
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  • 4
    Publication Date: 2019-08-28
    Description: The basic mission sequence to achieve the President's goal is clear: begin with Space Station Freedom in the 1990's, return to the Moon to stay early in the Next century, and then journey to Mars. Five reference approaches are modeled building on past programs and recent studies to reflect wide-ranging strategies that incorporate varied program objectives, schedules, technologies, and resource availabilities. The reference approaches are (1) balance and speed; (2) the earliest possible landing on Mars; (3) reduce logistics from Earth; (4) schedule adapted to Space Station Freedom; and (5) reduced scales. The study and programmatic assessment have shown that the Human Exploration Initiative is indeed a feasible approach to achieving the President's goals. Several reasonable alternatives exist, but a long-range commitment and significant resources will be required. However, the value of the program and the benefits to the Nation are immeasurable.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-102999 , NAS 1.15:102999
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  • 5
    Publication Date: 2019-08-28
    Description: The nature of volcanic activity, theoretical models of its role in planetary evolution, and the evidence for volcanism on the planets and planetary satellites are examined in an introductory overview for advanced undergraduate and graduate students. Chapters are devoted to volcanism as a planetary process, the generation and evolution of magmas, magma ascent and eruption, the properties and behavior of volcanic flows, volcanic landforms, the distribution of volcanic rocks in the solar system, and volcanic plains and their development. Consideration is given to lunar volcanism, shield volcanoes and paterae, volcanism on Io, volcanism on icy satellites, and the rheological analysis of volcanic flows.
    Keywords: LUNAR AND PLANETARY EXPLORATION
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  • 6
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    Publication Date: 2019-08-28
    Description: NASA's Office of Exploration has undertaken four case studies for prospective expansion of manned space activities beyond earth orbit. The subjects of these studies are (1) an expedition to the Martian moon Phobos; (2) a three-mission expedition to Mars; (3) the construction of a man-tended lunar observatory; and (4) the construction of a lunar outpost to serve as the basis for construction of a Martian outpost. The fourth alternative would follow the recommendation of the National Commission on Space for the creation of a 'bridge between worlds' in which explorers would develop ways in which to 'live off the land' in a space environment.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Aerospace America (ISSN 0740-722X); 27; 40-43
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  • 7
    Publication Date: 2019-08-27
    Description: Alternative models of heliocentric and planetocentric crater-forming bombardments of Ganymede and Callisto are presently tested in view of the crater density and size frequency distribution measurements of several distinct Ganymede terrains. The results obtained are interpreted to indicate that the spatial distributions of most classes of craters on Ganymede, as well as the younger craters of Callisto, are more consistent with heliocentric than planetocentric bombardment. The sequence and type of surface modification on Ganymede were then inferred, with absolute ages being dependent on the assumption of heliocentric bombardment.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus (ISSN 0019-1035); 81; 271-297
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  • 8
    Publication Date: 2019-08-27
    Description: This is a compilation of abstracts of reports from Principal Investigators of NASA's Planetary Geology and Geophysics Program, Office of Space Science and Applications. The purpose is to document in summary form research work conducted in this program during 1988. Each report reflects significant accomplishments within the area of the author's funded grant or contract.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-4130 , NAS 1.15:4130
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  • 9
    Publication Date: 2019-08-14
    Description: Neptune's atmosphere is revealed by Voyager 2 images to contain clouds of methane ice above a lower deck of hydrogen sulfide or ammonia ices, and to be dominated by an anticyclonic storm system designated the 'Great Dark Spot'; this bears both similarities and differences to the Great Red Spot of Jupiter. Like the rings of Uranus, those of Neptune are composed of very dark, but in addition very dusty, material. Six new regular satellites have been discovered whose radii range from 25 to 200 km. Triton is noted to be a differentiated body showing evidence of early surface-melting episodes. At least two active plumes are found on Triton, which may be driven by solar heating.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science (ISSN 0036-8075); 246; 1422-144
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  • 10
    Publication Date: 2019-08-14
    Description: The current state of knowledge of dynamic processes in the Jovian system is assessed and summaries are provided of both theoretical and observational foundations upon which future research might be based. There are three sections: satellite phenomena and rings; magnetospheric phenomena, Io's torus, and aurorae; and atmospheric phenomena. Each chapter discusses time dependent theoretical framework for understanding and interpreting what is observed; others describe the evidence and nature of observed changes or their absence. A few chapters provide historical perspective and attempt to present a comprehensive synthesis of the current state of knowledge.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-SP-494 , NAS 1.21:494 , LC-88-25450 , Aug 25, 1987 - Aug 27, 1987; Flagstaff, AZ; United States
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