土卫六：土星上的卫星
(原标题: Titan: Moon over Saturn)
2022-05-27
浏览次数: 16
像地球的卫星一样，土星最大的卫星土卫六也处于同步旋转状态。卡西尼号宇宙飞船在2012年5月拍摄的这组图像显示了它的反土星面，这面总是背对着这个带环的气体巨星。土卫六是太阳系中唯一一颗拥有致密大气层的卫星，也是除地球之外已知的太阳系中唯一一颗表面有固定的液态天体，并有类似地球的液态雨和蒸发循环的行星。卡西尼号在土星环和云顶上方拍摄到的这颗直径5000公里的卫星的照片中，它的高空大气薄雾层很明显。靠近中央的是被称为香格里拉的深色沙丘地区。卡西尼号搭载的惠更斯号探测器在距离地球最远的航天器着陆后，位于图中左下方。
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Like Earth's moon, Saturn's largest moon Titan is locked in synchronous rotation. This mosaic of images recorded by the Cassini spacecraft in May of 2012 shows its anti-Saturn side, the side always facing away from the ringed gas giant. The only moon in the solar system with a dense atmosphere, Titan is the only solar system world besides Earth known to have standing bodies of liquid on its surface and an earthlike cycle of liquid rain and evaporation. Its high altitude layer of atmospheric haze is evident in the Cassini view of the 5,000 kilometer diameter moon over Saturn's rings and cloud tops. Near center is the dark dune-filled region known as Shangri-La. The Cassini-delivered Huygens probe rests below and left of center, after the most distant landing for a spacecraft from Earth.