s*****t
发帖数: 1994 | 1 Enceladus Creates Saturn's E Ring
Credit: CICLOPS, JPL, ESA, NASA
Explanation: The active moon Enceladus appears to be making Saturn's E ring.
An amazing picture showing the moon at work was taken late last year by the
Saturn-orbiting Cassini spacecraft and is shown above. Enceladus is the
bright point near the center, right near the center of Saturn's E ring.
Streams of ice and water vapor can be seen pouring off Enceladus into the E
ring. The above bright image of the normally faint E-ring was |
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s*****t
发帖数: 1994 | 2 Enceladus Creates Saturn's E Ring
Credit: CICLOPS, JPL, ESA, NASA
Explanation: The active moon Enceladus appears to be making Saturn's E ring.
An amazing picture showing the moon at work was taken late last year by the
Saturn-orbiting Cassini spacecraft and is shown above. Enceladus is the
bright point near the center, right near the center of Saturn's E ring.
Streams of ice and water vapor can be seen pouring off Enceladus into the E
ring. The above bright image of the normally faint E-ring was |
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s*****t
发帖数: 1994 | 3 Ski Enceladus
Credit: Cassini Imaging Team, SSI, JPL, ESA, NASA
Explanation: Small, icy, inner moon of Saturn, Enceladus is only about 500
kilometers in diameter. But the distant world does reflect over 90
percent of the sunlight it receives, giving its surface about the same reflectivity
as fresh snow. Seen here in a sharp view from the Cassini
spacecraft's recent flyby, Enceladus shows a variety of surface
features and very few impact craters - indicating that it has been an active
world even |
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Z**R
发帖数: 1233 | 4 Saturn's moon Enceladus surprisingly comet-like
* 21:24 26 March 2008
* NewScientist.com news service
* Stephen Battersby
Saturn's curious moon Enceladus appears to have the same chemical makeup as
a comet, according to the latest results from the Cassini probe. That's a
big surprise, as Enceladus should have formed in very different conditions
from those of comets.
On 12 March, Cassini flew through the huge plume of steam and other gases
that spews from fissures at the moon's south |
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s*****t
发帖数: 1994 | 5 Ski Enceladus
Credit: Cassini Imaging Team, SSI, JPL, ESA, NASA
Explanation: Small, icy, inner moon of Saturn, Enceladus is only about 500
kilometers in diameter. But the distant world does reflect over 90
percent of the sunlight it receives, giving its surface about the same reflectivity
as fresh snow. Seen here in a sharp view from the Cassini
spacecraft's recent flyby, Enceladus shows a variety of surface
features and very few impact craters - indicating that it has been an active
world even |
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Z**R
发帖数: 1233 | 6 By Molly Bentley
Science reporter, San Francisco
An ocean is not the source of the jets emanating from Saturn's moon
Enceladus, a new study concludes.
The research questions the moon's promise as a target in the search for life
beyond Earth and has stirred controversy among scientists who dispute its
conclusions.
A chemical analysis of Enceladus, led by University of Colorado planetary
scientist Nick Schneider, failed to detect sodium, an element scientists say
should be in a body of water that |
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Z**R
发帖数: 1233 | 7 "tiger stripe" on Enceladus
Eight jet source locations are identified (labelled with yellow roman
numerals). The hotspots identified through infrared observations are marked
by red boxes. All features on Enceladus take their names from places or
people in the Arabian Nights. |
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D******g
发帖数: 2717 | 8 可以在那里殖民不？有水了，又可以从太阳取能量。
根据卡西尼探测器连续多年拍摄的土卫二照片，天文学家发现这颗冰卫星在绕着土星公
转的过程中会发生极其轻微的摇摆。这种摇摆只有一个解释，那就是这颗卫星的冰壳之
下，存在一个覆盖全球的液态水海洋。(文字来源：果壳网；图片来源：NASA/JPL-
Caltech)
关注太空探索的朋友们一定对土卫二不陌生。土卫二(Enceladus)直径约500公里，
围绕土星运转。其中心为岩石，距离太阳遥远，因而极为寒冷，表面被厚厚的冰层所覆
盖。NASA曾在几个月前宣布，土星卫星Enceladus南极区域有温暖的海洋，存在热液喷
口。
而就在昨天，NASA再次证实了在Enceladus表面覆盖的冰层之下，确实有一片巨大
的海洋。大到什么程度呢？答案是：包裹着整个卫星！
这是人类首次在太阳系中发现于地球之外的可供生命存在的环境，历史意义可谓重
大。
这篇广袤的大海之所以能够被人类发现，是因为研究人员发现土卫二在围绕土星旋
转的过程中存在很轻微的晃动。而这一现象唯一合理的解释就是：土卫二的表面冰层并
非冻结在固体内壳上，而是漂浮于海洋之上。
也就是说，此前卡西尼号... 阅读全帖 |
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j**y
发帖数: 80 | 9 纽约时报和华盛顿邮报等主流媒体普遍关注美国发射“炸弹之母”打击伊斯兰国（ISIS
）一事。同时，朝鲜方面称随时可以进行核试验也成为媒体关注焦点。美国有线电视新
闻网（CNN）认为，鲁莽的特朗普可能无法战胜金正恩。此外，美国电视新闻网刊文分
析称，特朗普对地缘政治现实低头，转变了对俄立场。
下面是美国东部时间2017年4月13日美媒网站与期刊的重点新闻内容概要：
社论
华盛顿邮报社论《特朗普最近的立场转变是应该（谨慎）庆祝的》认为，特朗普总统（
Donald Trump）在很多问题上从颠覆传统转变到步入正轨是不该吹毛求疵，而是应该谨
慎庆祝的。这主要归功于：一是出色的国家安全委员会团队的意见塑造了特朗普，二是
因为特朗普的转变更贴近选民的传统道德价值。如果美国人的慷慨本性能把特朗普推向
主流价值观，那么就应该欢迎它。
纽约时报题为《塞申斯对边境的肆意打击》认为，美国家司法部长塞申斯（Jeff
Sessions）于11日抵达美国和墨西哥边境，并称美国人必须阻止来自墨西哥的邪恶移民
浪潮。他对打击移民的痴迷，否认了想要寻求更好生活的移民的存在，因为任何人都有
权在法律下被公平地对待，并有尊严... 阅读全帖 |
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R*****d
发帖数: 1148 | 10 神九升空，应个景儿。
农历初九的晴夜，架起三四十倍小天文望远镜看月亮，月面明暗交界处，依次可见如糖
葫芦般串在一起的三个大环形山，从上向下排开（究竟是上是下，取决于你的望远镜）
，依次是托勒密，阿方索，阿尔扎切尔（Arzachel）。这串糖葫芦，或可谓是初级天文
爱好者观察月球的最初收获。略微深入月面的明亮部分，糖葫芦的右侧，如果仔细辨别
，可以看到巴塔尼（Albategnius），阿布·菲达（Abulfeda），迈蒙（Almanon），也是
三个不小的环形山。倘若早上一两天，利用明暗线--即地球的影子边缘--扫过后面这三
个环形山的时机来进行观测，看得就更清楚了（具体位置和形状请见第一张附图，注
意该图以南方为上）。这个迈蒙环形山，就是诃论的儿子，阿拉伯帝国阿拔斯王朝哈里
发迈蒙？没错，就是丫的。。。没骂人，谁让他妈是丫头出身呢。
虽说把名字刻在于地球上能看到也只能看到的月球正面，可谓极大的殊荣，但不幸的是
，大多数比较显眼的环形山命名，都是十七世纪中期的耶稣会成员，乔万尼 里奇奥利
（Giovanni Battista Riccioli）留下的。这种来自具有严格纪律和组织的宗教团体... 阅读全帖 |
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c*****1
发帖数: 3240 | 11 ☆─────────────────────────────────────☆
Reynold (吾爱真理，但吾更爱吾妻) 于 (Wed Jun 20 16:29:56 2012, 美东) 提到:
神九升空，应个景儿。
农历初九的晴夜，架起三四十倍小天文望远镜看月亮，月面明暗交界处，依次可见如糖
葫芦般串在一起的三个大环形山，从上向下排开（究竟是上是下，取决于你的望远镜）
，依次是托勒密，阿方索，阿尔扎切尔（Arzachel）。这串糖葫芦，或可谓是初级天文
爱好者观察月球的最初收获。略微深入月面的明亮部分，糖葫芦的右侧，如果仔细辨别
，可以看到巴塔尼（Albategnius），阿布·菲达（Abulfeda），迈蒙（Almanon），也是
三个不小的环形山。倘若早上一两天，利用明暗线--即地球的影子边缘--扫过后面这三
个环形山的时机来进行观测，看得就更清楚了（具体位置和形状请见第一张附图，注
意该图以南方为上）。这个迈蒙环形山，就是诃论的儿子，阿拉伯帝国阿拔斯王朝哈里
发迈蒙？没错，就是丫的。。。没骂人，谁让他妈是丫头出身呢。
虽说把名字刻在于地球上能看到也只能看到的月球正面... 阅读全帖 |
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s*******u
发帖数: 676 | 12 查了一下，你说的例子都是锁定的。“只有一颗例外”确实是很久以前看到的，后来也
许又有发现。但是，锁定的是常态，没锁定的是极少数。主要条件就是要有足够的时间
，对旋物体中小的那个会被锁定。
List of known tidally locked bodies[edit]
Solar System[edit]
Parent body Tidally-locked satellites[19]
Sun Mercury[20][21][12] (3:2 spin-orbit resonance)
Earth Moon
#############################################
##### Mars Phobos[22] · Deimos[23] #####
Jupiter Metis · Adrastea · Amalthea · Thebe · Io · Europa ·
Ganymede · Callisto
Saturn Pan · Atlas · Prometheus · Pandora · Epimetheus ·... 阅读全帖 |
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W***n
发帖数: 11530 | 13 A close-up with a comet
by Staff Writers
Chicago IL (SPX) Nov 12, 2014
On Nov. 12 a robotic lander called Philae is scheduled to touch down on a
comet, following a journey of 10 years and more than 3.7 billion miles. The
mission aims to provide insights into how the solar system evolved, and
whether comet impacts helped form Earth's oceans and brought chemical
precursors of life. (Image courtesy of European Space Agency).
Even as Tom Economou approached retirement age in 1994, he began planning ... 阅读全帖 |
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b********e
发帖数: 600 | 14 土卫一 Mimas
土卫二 Enceladus
土卫三 Tethys
土卫四 Dione
土卫五 Rhea
土卫六 Titan
土卫七 Hyperion
土卫八 Iapetus
土卫九 Phoebe
。。。 |
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s*****t
发帖数: 1994 | 16 In the shadow of Saturn, unexpected wonders appear. The robotic Cassini
spacecraft now orbiting Saturn drifted in giant planet's shadow for about 12
hours in 2006 and looked back toward the eclipsed Sun. Cassini saw a view
unlike any other. First, the night side of Saturn is seen to be partly lit
by light reflected from its own majestic ring system. Next, the rings
themselves appear dark when silhouetted against Saturn, but quite bright
when viewed away from Saturn, slightly scattering sunlight,... 阅读全帖 |
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