By R. S. Saunders, R. E. Arvidson, G. D. Badhwar, W. V. Boynton (auth.), Christopher T. Russell (eds.)
Mars, the main liveable of our sister planets, holds a different position in our imaginations and in our house exploration software. totally half NASA's planetary exploration attempt is now dedicated to Mars. Key questions contain: Has Mars ever harbored existence? Is there existence on Mars now? Will people be ready to continue to exist at the Martian floor? solutions to those questions lie in picking out the current place of water on Mars and its most likely stock long ago, and in selecting the current radiation surroundings of Mars. The 2001 Mars Odyssey undertaking contributes enormously those solutions via detecting near-surface water via measurements of neutron flux, from the detection of carbonates, and the quantification of its radiation surroundings. This booklet captures the ambitions, the layout of the undertaking and the main points of the tools carried to Mars. it may be of curiosity to each scientist attracted to partaking within the on-going exploration of Mars from graduate scholars to senior scientists because it offers the heritage details necessary to interpret the various intriguing effects now showing from the mission.
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Additional info for 2001 Mars Odyssey
615 MeV gamma ray emitted by its 20sTI daughter. 239 MeV e 12 Pb). 352 MeV 14 Pb). , 1973). Non-uniformity in composition as a function of depth in the top layer from which gamma rays escape can be detected because gamma rays of different energies are attenuated by different amounts. 2. Nonelastic-scattering-produced gamma rays The GCR-produced neutrons discussed above are the major source of gamma rays for most other elements. GCR particles can induce a wide range of reactions. An example of a reaction induced by GCR particles is the production of radioactive 24Na from aluminum by a reaction in which a neutron enters a 27 Al nucleus and an alpha particle exits leaving a 24Na nucleus.
6 hours (the expected range was 15 -24 hours). Oxidizer burn-to-depletion was detected and triggered the burn cutoff as planned. The main engine thrust level was somewhat lower than expected (due to a better balanced spacecraft), resulting in a burn time of 1219 seconds versus an expected value of 1183 seconds. No period reduction maneuver following MOl was required. Aerobraking provided a means of transitioning from the initial elliptical orbit immediately after arrival to the desired near circular mapping orbit.
1-10 Ge V Inucleon. At these high energies, most of the GCR particles react before they are slowed much 40 w. V. BOYNTON ET AL. by energy-loss mechanisms when interacting with matter. 1- 20 Me V, per incident primary particle (Reedy and Arnold, 1972). Charged secondary particles, such as protons, with such energies are fairly rapidly stopped by ionization energy losses. Secondary neutrons, however, travel until they undergo an interaction with a nucleus in the planet's surface or escape to space.