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NASA 美国宇航局的每日一图 3月份

发布: 2009-1-14 17:53 | 作者: webmaster | 来源: 本站原创 | 查看: 156次

2008 March 24

卡西尼拍到的土星和土卫六 Saturn and Titan from Cassini

Explanation: Spectacular vistas of Saturn and its moon continue to be recorded by the Cassini spacecraft. Launched from Earth in 1997, robotic Cassini entered orbit around Saturn in 2004 and has revolutionized much of humanity's knowledge of Saturn, its expansive and complex rings, and it many old and battered moons. Soon after reaching Saturn, Cassini released the Huygen's probe which landed on Titan, Saturn's largest moon, and send back unprecedentedpictures from below Titan's opaque cloud decks. Recent radar images of Titan from Cassini indicate flat regions that are likely lakes of liquid methane, indicating a complex weather system where it likely rains chemicals similar to gasoline. Pictured above, magnificent Saturn and enigmatic Titan were imaged together in true color by Cassini earlier this year.

卡西尼飞船拍摄到的土星和土卫六

影像提供：Cassini Imaging Team, SSI, JPL, ESA, NASA

说明：卡西尼飞船依旧拍摄到了土星及其卫星的壮观影像。1997年从地球发射升空后，卡西尼飞船在2004年进入土星绕行轨道，它让人们对土星的了解发生了翻天覆地的变化，那广阔而复杂的光环，还有许多历尽沧桑的卫星。在到达土星之后，卡西尼飞船立即释放了在土星最大卫星土卫六上着陆的惠更斯探测器，并在土卫六模糊的云盖下拍摄并传回了空前详细的影像。最近，卡西尼飞船利用雷达拍摄到土卫六的影像，其中暗示平坦的区域可能是液态甲烷湖泊，这就说明土卫六上有一个复杂的气候系统，在那里雨的化学成分跟汽油相似。雄伟的土星和谜一般的土卫六一起出现在上面这张卡西尼飞船今年初拍摄的真色彩影像中。