透视土卫六

透视土卫六

2023年3月31日 Seeing Titan Image Credit: VIMS Team, U. Arizona, U. Nantes, ESA, NASA Explanation: Shrouded in a thick atmosphere, Saturn’s largest moon Titan really is hard to see. Small particles suspended in the upper atmosphere cause an almost impenetrable haze, strongly scattering light at visible wavelengths and hiding Titan’s surface features from prying eyes. But Titan’s surface is better imaged at infrared wavelengths where scattering is weaker and atmospheric absorption is reduced. Arrayed around this visible light image (center) of Titan are some of the clearest global infrared views of the tantalizing moon so far. In false color, the six panels present a consistent processing of 13 years of infrared image data from the Visual and Infrared Mapping Spectrometer (VIMS) on board the Cassini spacecraft…

银河巨人土卫六和土星

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