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  • 1
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    On the mass of Saturn's rings (1977)
    Oxford University Press
    Details
    Publication Date: 1977-08-01
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press on behalf of The Royal Astronomical Society.
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    PAPER CURRENT
  • 2
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    Galileo's progress (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Data obtained to date by the Galileo spacecraft launched in October 1989 are discussed. It is noted that in April 1991 the spacecraft's high-gain antenna failed to deploy from its furled position. Since then, communications including return of images of the Gaspra asteroid have been performed through the low-gain antenna. It is considered to be possible to accomplish the majority of orbiter scientific objectives without the high-gain antenna including the return of high resolution images.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Spaceflight (ISSN 0038-6340); 34; 10; p. 327-331.
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  • 3
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    Magellan orbits Venus (1990)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Various events surrounding Magellan's orbit of Venus are recounted. Significant events include the successful firing of a solid rocket motor while the spacecraft was behind Venus to transfer it from a solar-centered trajectory to an orbit around the planet. The spacecraft orbits Venus every 3.26 hours at a maximum altitude of 8500 km and minimum altitude of 291 km in an elliptical orbit. The successful August 16 test of the synthetic-aperture radar system is discussed, noting that it produced two strips, each about 20 km x 16,000 km, revealing details as small as 120 m. Two anomalies causing a delay in the start of mapping operations and subsequent breaks in the communication link with earth for 14.5 hours and 17.7 hours are discussed. Protective measures directed from the spacecraft's ROM during breach of contact are listed, and possible causes of the anomalies are suggested, such as solar activity or hardware or software elements, although the actual cause is not yet known.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Spaceflight (ISSN 0038-6340); 32; 334-337
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    NASA TECHNICAL REPORTS
  • 4
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    Display of celestial surveys conducted from orbit (1986)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Two methods are described for graphically displaying and numerically analyzing surveys of the celestial sphere as conducted by astronomical satellites. The methods are applicable to the design phase of a mission, for planning during operations, and for post-mission display of results. Both methods have been tested in use, including application to the Infrared Astronomical Satellite (IRAS).
    Keywords: ASTRONOMY
    Type: Journal of the Astronautical Sciences (ISSN 0021-9142); 34; 91-116
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  • 5
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    Venus geology (1991)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The Magellan mission to Venus is reviewed. The scientific investigations conducted by 243-day cycles encompass mapping with a constant incidence angle for the radar, observing surface changes from one cycle to the next, and targeting young-looking volcanos. The topography of Venus is defined by the upper boundary of the crust and upwelling from lower domains. Tectonic features such as rift zones, linear mountain belts, ridge belts, and tesserae are described. The zones of tesserae are unique to the planet. Volcanism accounts for about 80 percent of the observed surface, the remainder being volcanic deposits which have been reworked by tectonism or impacts. Magellan data reveal about 900 impact craters with flow-like ejecta resulting from the fall of meteoroids. It is concluded that the age of the Venusian surface varies between 0 and 800 million years. Tectonic and volcanic activities dominate the formation of the Venus topography; such processes as weathering and erosion are relatively unimportant on Venus.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Spaceflight (ISSN 0038-6340); 33; 156-160
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  • 6
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    Through the tail of a comet (1984)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The instrumentation, trajectory, and missions of the ISEE-3 spacecraft being sent to observe Comet Giacobini-Zimmer (GZ) are described. Originally parked at a libration point to observe the solar wind, ISEE-3 was directed to perform a complex series of flybys of the earth and the moon to move to a trajectory that will intersect the GZ tail in 1985. Renamed ICE, the spacecraft will record magnetic field and charged particle data on the interaction of the cometary tail with the solar wind.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: Spaceflight (ISSN 0038-6340); 26; 405-409
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  • 7
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    Human evolution in the age of the intelligent machine (1983)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: A systems analysis of the future evolution of man can be conducted by analyzing the biological material of the galaxy into three subsystems: man, intelligent machines, and intelligent extraterrestrial organisms. A binomial interpretation is applied to this system wherein each of the subsystems is assigned a designation of success or failure. For man the two alternatives are, respectively, 'decline' or 'flourish', for machine they are 'become intelligent' or 'stay dumb', while for extraterrestrial intelligence the dichotomy is that of 'existence' or 'nonexistence'. The choices for each of three subsystems yield a total of eight possible states for the system. The relative lack of integration between brain components makes man a weak evolutionary contestant compared to machines. It is judged that machines should become dominant on earth within 100 years, probably by means of continuing development of existing man-machine systems. Advanced forms of extraterrestrial intelligence may exist but are too difficult to observe. The prospects for communication with extraterrestrial intelligence are reviewed.
    Keywords: SPACE SCIENCES (GENERAL)
    Type: Interdisciplinary Science Reviews (ISSN 0308-0188); 8; 4, 19
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  • 8
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    Kantian epistemology as an alternative to heroic astronomy (1985)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Theoretical and observational methods in astronomy have advanced to a point where certain of their outcomes are difficult to comprehend with the traditional categories of human knowledge. The philosophical discipline of epistemology, the theory of knowledge, is used here to address four current problems in observational astronomy, exobiology, cosmology, and quantum mechanics. The problems are united by an epistemological content which, when unrecognized, has resulted in some heroic solutions of an ad hoc nature. Kant's critical philosophy is employed because his work is consistent with basic attitudes in present-day physics and biology.
    Keywords: GENERAL
    Type: Vistas in Astronomy (ISSN 0083-6656); 28; 611-639
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  • 9
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    Voyager at the seventh planet (1985)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The success of the Voyager 1 flyby of Titan permitted configuring the Voyager 2 trajectory for flybys of Uranus and Neptune. Satellite instruments will gather data on the Uranian atmosphere, rings, satellites and magnetosphere (if there is one). The observational sequences were coded for transmission to Voyager 2 in November 1985. Earlier commands have stabilized the spacecraft to avoid image smearing during the approach and have reduced the time of firing of the thrusters for course changes. Imaging data compression will economize on the degraded communications link to Voyager 2 and lower the demands on the slowly failing radiothermoelectric power supply. The encounter will take place in February 1986 and, should failure of the command link occur, be accompanied by carrying out of a preprogrammed set of observational and operational sequences lasting through a 1989 Neptune flyby.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Spaceflight (ISSN 0038-6340); 27; 403-409
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  • 10
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    Pathways of evolution for man and machine (1983)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: A simplified model of the future is introduced in order to examine the relations between man, machine, and extraterrestrial intelligence. The observed lack of extraterrestrials on earth is used as a boundary condition for the model. Two exobiological conclusions are obtained: (1) advanced extraterrestrials exist but are difficult to observe or to distinguish from natural phenomena, (2) lower level, man-like extraterrestrials, which are potentially observable, are rare in the Universe because they are rapidly replaced in the evolutinary sequence by the intelligent machines which they create. The decline of man is inferred and may take place as soon as 100 years from now or as long as 100,000 years from the present time. Thus, we are a short-lived species, having a life expectancy of only a million years. A note is appended on the rationale and methods of the search for extraterrestrial intelligence in light of the above calculations. The Tau Ceti and Epsilon Eridani systems present favourable opportunities for a radio-search experiment in 1987 and 1988, respectively.
    Keywords: SPACE SCIENCES (GENERAL)
    Type: (ISSN 0007-084X)
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