To seek the answer to this mystery, NASA has launched five satellites aboard a Delta rocket from Florida to train their instruments on the northern and southern lights.The project is called THEMIS .

• 为了解开这个谜；NASA已经用四等星火箭从佛罗里达州发射了5颗卫星；并试验探测南北极光的仪器.；这个项目叫做THEMIS