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B. ), Vol. 71, "Science and Technology Series," Proceedings of the NASA Mars Conference, July 21-23, 1986. 2 Lessons Learned from the Viking Planetary Quarantine and Contamination Control Experience," NASW-4355, The Bionetics Corp. 3 Ezell, E. C, and Ezell, L. , "On Mars-Exploration of the Red Planet 19581978," NASA SP-4212, 1984. 4 Holmberg, N. , Faust, R. , and Holt, H. , "Viking '75 Spacecraft Design and Test Summary. Volume 1: Lander Design," NASA Reference Publ. 1027, Nov. 1980. Purchased from American Institute of Aeronautics and Astronautics This page intentionally left blank Purchased from American Institute of Aeronautics and Astronautics Chapter 6 Viking Mission Overview: Lessons Learned and Challenges for the Future E.
Molecular nitrogen does not condense out of the atmosphere as does H2O vapor, and does not dissolve into the oceans as does carbon dioxide. Chemically inert nitrogen accumulated in the atmosphere to become the most abundant atmospheric constituent. 9 x 1021 g). 19 It is generally assumed that over its history, Mars also outgassed significant quantities of H2O, CO2, and N2. The ratio of volatile outgassing on Mars to Earth was most likely proportional to the ratio of the mass of Mars to the mass of Earth, since the outgassed volatiles were incorporated Table 4 Fate of ungassed volatiles (in units of grains) H2O Atmosphere Oceans Sedimentary rocks Total outgassed volatiles Source: Ref.
The homogeneous accretion model predicted that the Earth formed initially as a cold and chemically homogeneous body, with free iron uniformly distributed throughout the interior of the planet. According to this model, sometimes after it formed, the Earth began to heat due to radiogenic decay. The heating caused the Earth to become molten, at which time the iron migrated to the core. In the homogeneous accretion model, the Earth was heated and the iron migrated to the core sometime after its formation (during the first billion years).
Technical Issues in UWB Radar Systems by ENGLER
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