NASA·APOD每日天文一图2022.5.27 [超高清]

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. 

像地球的卫星一样，土星最大的卫星泰坦也被锁定在同步旋转中。2012年5月，卡西尼号宇宙飞船拍摄的这幅马赛克图像显示了它的反土星一面，这一面总是背对着环形气体巨星。土卫六是太阳系中唯一一颗大气层稠密的卫星，是除地球外唯一已知的太阳系星球，其表面有直立的液态物体，以及类似地球的液态雨和蒸发循环。在卡西尼号拍摄的土星环和云顶上方直径5000公里的卫星照片中，可以明显看到它的高海拔大气薄雾层。靠近中心的是被称为香格里拉的黑暗沙丘地区。卡西尼号运载的惠更斯探测器在距离地球最远的航天器着陆后，停在中心下方和左侧。