银河巨人土卫六和土星

Titan, Saturn’s largest moon, looks quite small in comparison to the giant planet behind it in this natural color view from the Cassini-Huygens spacecraft. This image from Aug. 29, 2012, also shows seasonal changes occurring on Saturn; as spring comes to the northern Saturnian hemisphere, the azure blue seen fades, while winter in the south adds a bluish hue. This phenomenon is likely due to shifts in the intensity of ultraviolet light and the haze it produces.

Image Credit: NASA/JPL-Caltech/Space Science Institute

在卡西尼-惠更斯号宇宙飞船拍摄的这张自然色照片中，土星最大的卫星土卫六与身后的巨行星相比显得相当小。这张2012年8月29日拍摄的照片也显示了土星上发生的季节变化；随着土星北半球的春天到来，所见的湛蓝逐渐褪去，而南方的冬天则增添了一抹蓝色。这种现象可能是由于紫外线强度的变化及其产生的雾霾造成的。

影像来源：NASA/JPL-Caltech/Space Science Institute