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  • Lunar and Planetary Science and Exploration  (2)
  • 2005-2009  (2)
  • 2006  (2)
  • 1
    Publication Date: 2019-07-19
    Description: Water is a unique substance in the protoplanetary nebula since both solid and gaseous phases coexist in large quantities. Quantitative estimates of their relative abundances are important parameters regarding the physical state of the nebula and planet formation processes. This new model is based on computing the chemical evolution of water molecules until its partial pressure is sufficient to pierce the vapor pressure curve for water. The point at which this occurs relative to its steady state values determines final gas/ice ratios. The wide range of temperatures and densities in typical protoplanetary disks result in a range of gadice ratios. It is found that although ice dominates the mid and far nebula, water vapor is predominant in the centerplane region of the near nebula and above the disk photosphere. An interesting near nebula effect is the appearance of a cloud of water ice at the temperature inversion elevation surrounded by vapor above and below. This work is partially supported by the NASA Astrobiology Institute.
    Keywords: Lunar and Planetary Science and Exploration
    Type: 2006 DPS Meeting; Oct 08, 2006 - Oct 13, 2006; Pasadena, CA; United States
    Format: text
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  • 2
    Publication Date: 2019-07-13
    Description: As humans venture farther from Earth for longer durations, it will become essential for those on the journey to have significant control over the scheduling of their own activities as well as the activities of their companion systems and robots. However, the crew will not do all the scheduling; timelines will be the result of collaboration with ground personnel. Emerging technologies such as in-space message buses, delay-tolerant networks, and in-space internet will be the carriers on which the collaboration rides. Advances in scheduling technology, in the areas of task modeling, scheduling engines, and user interfaces will allow the crew to become virtual scheduling experts. New concepts of operations for producing the timeline will allow the crew and the ground support to collaborate while providing safeguards to ensure that the mission will be effectively accomplished without endangering the systems or personnel.
    Keywords: Lunar and Planetary Science and Exploration
    Type: IEEEAC Paper 1415 , IEEE Aerospace Conference 2007; Mar 03, 2007 - Mar 10, 2007; Big Sky, MT; United States
    Format: application/pdf
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