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To be spacefaring is to be capable of and active in the art of space travel or space transport, the operation of spacecraft or spaceplanes. It involves a knowledge of a variety of topics and development of specialised skills including (but not limited to): aeronautics; astronautics; programs to train astronauts; space weather and forecasting; ship-handling and small craft handling; operation of various equipment; spacecraft design and construction; atmospheric takeoff and reentry; orbital mechanics (aka astrodynamics); communications; engines and rockets; execution of evolutions such as towing, micro-gravity construction, and space docking; cargo handling equipment, dangerous cargoes and cargo storage; spacewalking; dealing with emergencies; survival at space and first aid; fire fighting; life support. The degree of knowledge needed within these areas is dependent upon the nature of the work and the type of vessel employed. "Spacefaring" is analogous to seafaring. Until now, there has never been a crewed mission outside the Earth–Moon system (so far as the human inhabitants of planet Earth are concerned or aware of). However, the United States, Russia, China, European Space Agency countries, and a few corporations and enterprises have plans in various stages to travel to Mars (see Manned mission to Mars). Spacefaring entities can be both sovereign states and private corporations. Spacefaring nations are those capable of independently building and launching craft into space.〔(spacefaring - Definitions from Dictionary.com )〕〔(spacefaring. The American Heritage Dictionary of the English Language: Fourth Edition. 2000 )〕〔(space-faring nation thefeedictionary.com )〕 A growing number of private entities have become or are becoming space faring. == Crewed spacefaring nations == Currently Russia, and the People's Republic of China are the only two crewed spacefaring nations. The United States government ceased crewed space missions in July 2011 after STS-135. The US is currently developing new crewed spacecraft, and many US private business are in the planning and development stage of private crewed space flight. Spacefaring nations listed by year of first crewed launch: # () (1961) # (2003) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「spacefaring」の詳細全文を読む スポンサード リンク
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