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operated jointly among five participating space agencies: the United States’ National Aeronautics and Space Administration (NASA), the European Space Agency (ESA), the Russian Federal Space Agency (RKA), the Japan Aerospace Exploration Agency (JAXA), and the Canadian Space Agency (CSA). Figure 1: The ISS orbiting the Earth as observed by Space Shuttle Discovery on March 26, 2009 An international crew, typically consisting of six members, resides on the ISS for approximately six months at a time. Since the first crew aboard the ISS in 1998, humans have maintained a permanent presence in space. In addition to the crew, personnel on the ground (located in Mission Control Centers) control the operations of the ISS. Maintaining a permanent human presence on the ISS requires a well-organized and precise life support system. Flight controllers, known as Environmental and Thermal Operating Systems (or ETHOS) operators, work in NASA’s ISS Mission Control Center and are responsible for the maintenance of this life support system. These operators also oversee the assembly and operation of multiple ISS subsystems and functions, including atmosphere control, supply and revitalization, internal thermal control, passive thermal control, temperature and humidity, fire detection and suppression, water recovery and management, and regenerative and emergency response. As ETHOS operators perform these duties, they are providing a safe environment for the ISS crew to live and perform valuable research in space. AP Course Topics Reactions • Reaction types o Oxidation-Reductionreactions − Oxidation number − The role of the electron in oxidation-reduction − Electrochemistry: electrolytic and galvanic cell; Faraday’s laws; Nernst equation; prediction of direction of redox reactions • Stoichiometry o Massandvolumerelationswithemphasisonthemoleconcept,includingempirical formulas and limiting reactants www.nasa.gov Oxygen Generator System 2/5PDF Image | OXYGEN GENERATOR SYSTEM
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