NASA 搬运工 D49
（早 土星的神奇卫星）
This view of Saturn’s dramatic, icy moon Dione, aptly named for a Titaness in Greek mythology, was eyed by our Cassini spacecraft on July 23, 2012 at a distance of approximately 260,000 miles.
这张土星戏剧性的冰冷的卫星Dione的视图恰好以希腊神话中的Titaness命名，于2012年7月23日在我们的卡西尼号太空船上观看，距离大约26万英里。
Dione, measuring about 698 miles across, has a density that suggests that almost a third of the moon is made up of a solid core (probably silicate rock) with the remainder of its material being water ice. At Dione's average temperature of -304 degrees Fahrenheit, ice is so hard it behaves like rock.
Dione的距离约为698英里，其密度表明几乎三分之一由坚硬的核心组成（可能是硅酸盐岩石），其余的物质是水冰。在Dione的平均气温-304华氏度下，冰块非常坚硬，就像岩石一样。
Astronomer Giovanni Domenico Cassini discovered Dione (1684) and three of Saturn’s other moons — lapetus (1671), Rhea (1672) and Tethys — as well as the large gap in Saturn's rings, now called the Cassini division. His namesake, our Cassini spacecraft, ended its more than 13 years exploring his findings and making many more with a dive into Saturn’s atmosphere on Sept. 15, 2017.
天文学家乔万尼多梅尼科卡西尼发现了Dione（1684年）和土星的其他三颗卫星 - lapetus（1671），Rhea（1672）和特提斯 - 以及土星环中的大缺口，现在称为卡西尼分区。他的同名卡西尼号航天飞机结束了13年多的探索研究，并在2017年9月15日潜入土星大气层发现了更多。
Credit: NASA/JPL-Caltech/Space Science Institute
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