失重训练是宇航员必需进行的一项重要训练项目,尽管在地球引力范围内很难达到失重状态,但可以通过模拟办法获得。在空中失重训练过程中,经过改装的 KC-135喷气式飞机在空中作垂直平面的大环状飞行。这样,宇航员便可得到30秒的失重环境,如此这般地折腾个把小时,宇航员便可完成吃喝、设备操作等训练课题。要想进行更长时间的训练就必须在压力 Weightlessness training is an essential training program for astronauts. Although weightlessness can not be achieved within the gravity range of the Earth, it can be simulated. During the weightlessness training in the air, the modified KC-135 jumbo plane makes a large, vertical plane flight in the air. In this way, astronauts can get 30 seconds weightlessness environment, so toss for hours, astronauts can complete the training of eating and drinking, equipment operations and other topics. It takes stress to work longer hours