标题: 过去和现在 [打印本页] 作者: 跨越地平线 时间: 2005-12-25 13:29 标题: 过去和现在 During Cassini's Dec. 26 flyby of Titan, the spacecraft will be in the same region that NASA's Voyager 1 flew by in 1980. Cassini's path through the tail of Titan's magnetic field will provide scientists new data to compare with what Voyager found 25 years ago.