载人航天是人类驾驶和乘坐载人航天器在太空中从事各种探测、研究、试验、生产和军事应用的往返飞行活动。其目的在于突破地球大气的屏障和克服地球引力,把人类的活动范围从陆地、海洋和大气层扩展到太空,更广泛和更深入地认识整个字 Manned space flights are manned and manned spacecraft carrying out various exploration, research, test, production and military applications of space shuttle flights in space. Its purpose is to break through the Earth’s atmosphere barrier and overcome the Earth’s gravity, extending the range of human activities from land, sea and atmosphere into space, more broadly and in-depth understanding of the entire word