And of all the places in the solar system that we might go to and search for answers to questions like this, there's Saturn. And we have been to Saturn before -- we visited Saturn in the early 1980s -- but our investigations of Saturn have become far more in-depth in detail since the Cassini spacecraft, traveling across interplanetary space for seven years, glided into orbit around Saturn in the summer of 2004,
在太阳系中我们足迹可以遍及的各个角落 我们寻找答案， 人类曾登上过土星-- 早在上世纪80年代初-- 人类对土星的探索变得更加深入、透彻 自打7年前罗西尼号探测器遨游在星际间 2004年罗西尼正式进入土星轨道，