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  • 1
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    Exploring planetary worlds (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A review of the planetary system is presented from a uniform perspective, taking advantage of the data obtained during the planetary space missions. A comparative approach is used, which makes it possible to consider each planet or a satellite in context, focusing both on their common origin and on the processes that have influenced their evolution. The discussion focuses on the Jovian planets, the moon and the Mercury, Venus and Earth, and small bodies in the outer solar system. Attention is also given to comets, asteroids, and cosmic impacts.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: ; 249 p.
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The Spaceguard Survey - Protecting the earth from cosmic impacts (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The conclusions of the NASA International Near-Earth-Object Detection Workshop (May 1991-January 1992) are summarized. Near-earth asteroids and short-period comets constitute about 90 percent of potential earth-impacting projectiles. The greatest risk is from those with diameters greater than 1 km. The objective of a near-earth object survey is to find such objects, calculate their long-term orbital trajectories, and identify any that may impact the earth over the next several centuries. There will generally be a period of at least several decades to take corrective action if any potential earth-impactors are found. A region of space extending outward from the earth to approximately the inner edge of the main asteroid belt must be monitored. Detection can be by reflected sunlight or infrared. Though faint, the objects should be readily detectable with ground-based telescopes, and thus there is no need for a more expensive space-based system.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Mercury (ISSN 0047-6773); 21; 3, Ma; 103-106
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Jupiter - First stop on Voyager's grand tour (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The findings concerning Jupiter that were made by the Voyager missions are briefly reviewed. The ring and three new moons around Jupiter, the live volcanoes on Io, and atmospheric phenomena on Jupiter which were observed by Voyager 1 are described. The discoveries regarding Callisto and Europa made by Voyager 2 are briefly summarized.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Planetary Report (ISSN 0736-3680); 9; 8-11
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Images from Galileo of the Venus cloud deck (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Images of Venus taken at 418 and 986 nm show that the morphology and motions of large-scale features change with depth in the cloud deck. Poleward meridional velocities, seen in both spectral regions, are much reduced in the NIR. In the south polar region the markings in the two wavelength bands are strongly anticorrelated. The images follow the changing state of the upper cloud layer downwind of the subsolar point, and the zonal flowfield shows a longitudinal periodicity that may be coupled to the formation of large-scale planetary waves. No optical lightning was detected.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science (ISSN 0036-8075); 253; 1531-153
    Format: text
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    NASA TECHNICAL REPORTS
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