APOD250901 卡利斯多：肮脏且满是伤痕的冰球
卡利斯多：肮脏且满是伤痕的冰球
图像提供: NASA[1], JPL-Caltech[2], Voyager 2[3]; Processing & License[4]: Kevin M. Gill[5];
英文原文:Explanation: Its surface is the most densely cratered in the Solar System -- but what's inside? Jupiter 's moon Callisto is a battered ball of dirty ice that is larger than the planet Mercury . It was visited by NASA's Galileo spacecraft in the 1990s and 2000s, but the recently reprocessed featured image is from a flyby of NASA's Voyager 2 in 1979. The moon would appear darker if it weren't for the tapestry of light-colored fractured surface ice created by eons of impacts. The interior of Callisto is potentially even more interesting because therein might lie an internal layer of liquid water. This potential underground sea is a candidate to harbor life -- similar with sister moons Europa and Ganymede . Callisto is slightly larger than Luna , Earth's Moon , but because of its high ice content is slightly less massive. ESA's JUICE and NASA's Europa Clipper missions are now headed out to Jupiter to better investigate its largest moons . 说明： 它的表面是太阳系中陨石坑最密集的地方-但是它的内部是什么样子呢？ 木星[6]的卫星卡利斯多(木卫四)[7]是一颗受损的脏冰球，其体积比行星水星[8]略小。 美国太空总署NASA的伽利略号太空船[9]在1990年代和2000年代曾拜访过它，但最近重新处理的主题图像[10]是来自1979年NASA的旅行者2号[11]飞掠时所拍摄。 如果不是因为数亿年撞击形成的浅色破碎[12]表面冰层，这颗卫星看起来会显得更暗。 卡利斯多的内部[13]可能更有趣，因为其中可能存在一层液态水。 这个潜在的地下海洋[14]可能是孕育生命[15]的候选地，类似于其姊妹卫星欧罗巴(木卫二)[16]和甘尼米德(木卫三)[17]。 卡利斯多比月球[18]，也就是地球的月亮[19]大，即便其冰含量很高，但质量也更大。 欧洲太空总署的JUICE[20]和NASA的欧罗巴快船[21]任务现在正前往木星[22]，以更好地研究其最大的卫星[23]。
明日的图片： flaming sky horse[24]
Authors & editors: Robert Nemiroff[25] (MTU[26]) & Jerry Bonnell[27] (UMCP[28])
NASA Official: Amber Straughn Specific rights apply[29].
NASA Web Privacy[30], Accessibility[31], Notices[32];
A service of: ASD[33] at NASA[34] / GSFC[35],
NASA Science Activation[36]
& Michigan Tech. U.[37]
太空天文实验室（成功大学物理系） <br/> 编辑：<a href="mailto:hantzong.su@gmail.com" style="color:gray;" target="_blank">苏汉宗</a>
编辑：陈炳志[38]
[3]https://science.nasa.gov/mission/voyager/voyager-2/
[4]https://creativecommons.org/licenses/by/2.0/deed.en/
[5]https://www.flickr.com/people/kevinmgill/
[6]https://science.nasa.gov/jupiter/
[7]https://science.nasa.gov/jupiter/jupiter-moons/callisto/
[8]https://science.nasa.gov/mercury/
[9]https://science.nasa.gov/mission/galileo/
[10]https://commons.wikimedia.org/wiki/File:Callisto_-_July_8_1979_(38926064465).jpg
[11]https://science.nasa.gov/mission/voyager/voyager-2/
[13]http://apod.nasa.gov/apod/ap981106.html
[14]https://www.jpl.nasa.gov/news/ocean-inside-jupiters-moon-callisto-may-have-cushioned-big-impact/
[15]https://www.numberanalytics.com/blog/astrobiological-potential-of-callisto
[16]http://apod.nasa.gov/apod/ap240329.html
[17]http://apod.nasa.gov/apod/ap231128.html
[18]https://en.wikipedia.org/wiki/Luna_(name)
[19]https://science.nasa.gov/moon/
[20]https://www.esa.int/Science_Exploration/Space_Science/Juice
[21]https://science.nasa.gov/mission/europa-clipper/
[22]http://apod.nasa.gov/apod/ap170523.html
[23]https://www.jpl.nasa.gov/images/pia01299-the-galilean-satellites/
[24]http://apod.nasa.gov/apod/ap250902.html
[25]http://www.phy.mtu.edu/faculty/Nemiroff.html
[27]https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
[29]http://apod.nasa.gov/apod/lib/about_apod.html#srapply
[30]https://www.nasa.gov/about/highlights/HP_Privacy.html
[31]https://www.nasa.gov/general/accessibility/
[32]https://www.nasa.gov/privacy/
[33]https://astrophysics.gsfc.nasa.gov/
[35]https://www.nasa.gov/centers/goddard/
[36]https://science.nasa.gov/learners
[38]mailto:alfred@ncku.edu.tw
http://apod.nasa.gov/apod/ap250901.html
http://sprite.phys.ncku.edu.tw/astrolab/mirrors/apod/ap250901.html
