Astronomy Picture of the Day——卫星、光环、阴影、云：土星（卡西尼）
Moons, Rings, Shadows, Clouds: Saturn(Cassini)
Image Credit: NASA, JPL-Caltech, SpaceScience Institute
Explanation: While cruising around Saturn,be on the lookout for picturesque juxtapositions of moons, rings, and shadows.One quite picturesque arrangement occurred in 2005 and was captured by the thenSaturn-orbiting Cassini spacecraft. In the featured image, moons Tethys andMimas are visible on either side of Saturn's thin rings, which are seen nearlyedge-on. Across the top of Saturn are dark shadows of the wide rings,exhibiting their impressive complexity. The violet-light image brings up thetexture of the backdrop: Saturn's clouds. Cassini orbited Saturn from 2004 until September of last year, when the robotic spacecraft was directed to diveinto Saturn to keep it from contaminating any moons.
卫星、光环、阴影、云：土星（卡西尼）
在环绕土星之时，要注意观察其卫星、光环、阴影以及云的奇特排列。上图是2005年出现的一次非常奇特的排列，恰好被环绕土星的“卡西尼号”捕获到。在这幅特写照片中，几乎侧视面向我们的土星细薄光环的两侧可以看到土卫一和土卫三。投射到土星顶部的是宽大光环的影子，向人们展示了它那令人印象深刻的复杂性。这张在紫光波段下拍摄的照片呈现了背景的纹理：土星的云。从2004年至2017年9月，“卡西尼号”一直围绕着土星飞行，任务结束后，为了防止污染其卫星，飞船接受指令坠毁于土星。
图片地址：
https://apod.nasa.gov/apod/image/1804/SaturnRingsMoons_Cassini_967.jpg
近期文章：
Astronomy Picture of the Day——费米伽马射线太空望远镜