每次执行航天任务时,太空飞船都必须携带足够的能源以完成各项工作,常见的能源形式包括化学推进燃料、光电池组和核能反应堆。除此之外,只能采用货运飞船供给方式,但费用昂贵得难以承受。例如要维持国际空间站在未来10年的预期使用寿命期间不致逐渐偏离轨道,就需要大约77吨的推 For each space mission, the spacecraft must carry enough energy to do its job. Common forms of energy include chemical propulsion fuels, photovoltaic cells and nuclear reactors. In addition, only the way of supply of cargo spacecraft, but the cost is too unbearable. For example, to keep the International Space Station from deviating from its orbit during the expected life span of the next 10 years, about 77 tons of thrust will be required