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木卫的外层卫星(中英)

木卫的外层卫星(中英)

Farthest from Jupiter (outward of the Galilean moons) are the eight tiny moons: Leda Ananke
  Himalia Carme
  Lysithea Pasiphae
  Elara Sinope
  Jupiter's eight outer moons fall into two groups: Leda, Himalia, Lysithea and Elara at about 11 million km from Jupiter and Ananke, Carme, Pasiphae and Sinope at about 23 million km. When the first version of The Nine Planets was written that was it. But in recent years several dozen tiny moons in various orbits farther out have been detected.
  Leda
  Jupiter XIII
  Leda is the ninth of Jupiter's known satellites and the smallest:
  orbit:    11,094,000 km from Jupiter
  diameter: 16 km
  mass:    5.68e15 kg
  Leda was queen of Sparta and the mother, by Zeus in the form of a swan, of Pollux and Helen of Troy.
  Discovered by Kowal in 1974.
  Leda, Ananke, and Sinope are among the smallest moons in the solar system.
  Himalia
  Jupiter VI
  Himalia is the tenth of Jupiter's known satellites:
  orbit:    11,480,000 km from Jupiter
  diameter: 186 km
  mass:    9.56e18 kg
  Himalia was a nymph who bore three sons of Zeus (Jupiter).
  Discovered by Perrine in 1904.
  Unlike the inner satellites, the orbits of Leda, Himalia, Lysithea and Elara are significantly inclined to Jupiter's equator (about 28 degrees).
  Lysithea
  Jupiter X
  Lysithea is the eleventh of Jupiter's known satellites:
  orbit:    11,720,000 km from Jupiter
  diameter: 36 km
  mass:    7.77e16 kg
  Lysithea was a daughter of Oceanus and one of Zeus' lovers.
  Discovered by Nicholson in 1938.
  Elara
  Jupiter VII
  Elara is the twelfth of Jupiter's known satellites: orbit:    11,737,000 km from Jupiter
  diameter: 76 km
  mass:    7.77e17 kg
  Elara was the mother by Zeus of the giant Tityus.
  Discovered by Perrine in 1905.
  Leda, Himalia, Lysithea and Elara may be remnants of a single asteroid that was captured by Jupiter and broken up.
  Ananke
  Jupiter XII
  Ananke is the thirteenth of Jupiter's known satellites:
  orbit:    21,200,000 km from Jupiter
  diameter: 30 km
  mass:    3.82e16 kg
  Ananke was the mother of Adrastea, by Jupiter.
  Discovered by Nicholson in 1951.
  Ananke, Carme, Pasiphae and Sinope have unusual but similar orbits.
  Carme
  Jupiter XI
  Carme is the fourteenth of Jupiter's known satellites:
  orbit:    22,600,000 km from Jupiter
  diameter: 40 km
  mass:    9.56e16 kg
  Carme was the mother, by Zeus of Britomartis, a Cretan goddess.
  Discovered by Nicholson in 1938.
  Ananke, Carme, Pasiphae and Sinope are especially unusual in that their orbits are retrograde.
  Pasiphae
  Jupiter VIII
  Pasiphae is the fifteenth of Jupiter's known satellites:
  orbit:    23,500,000 km from Jupiter
  diameter: 50 km
  mass:    1.91e17 kg
  Pasiphae was the wife of Minos and mother, by a white bull, of the Minotaur.
  Discovered by P. Melotte in 1908.
  Ananke, Carme, Pasiphae and Sinope have orbits highly inclined to Jupiter's equator (about 150 degrees).
  Sinope
  Jupiter IX
  Sinope is the outermost of Jupiter's known confirmed satellites:
  orbit:    23,700,000 km from Jupiter
  diameter: 36 km
  mass:    7.77e16 kg
  Sinope was a woman said to have been unsuccessfully courted by Zeus.
  Discovered by Nicholson in 1914.
  Ananke, Carme, Pasiphae and Sinope may be remnants of a single asteroid that was captured by Jupiter and broken up.
  离木星最远的(在伽利略发现的卫星以外)是以下八颗卫星:
  木卫十三  木卫十二
  木卫六  木卫十一
  木卫十  木卫八
  木卫七  木卫九
  木星的八颗外层卫星被分成两组:距木星大约1100万千米的木卫十三,木卫六,木卫十,木卫七和距木星大约2300万千米的木卫十二,木卫十一,木卫八,木卫九。
  Leda
  木卫十三
  Leda 是距木星第九近已知卫星,并且是最小的一颗:
  公转轨道:  距木星11,094,000 千米
  卫星直径:  16 千米
  质量:  5.68e15 千克
  Leda是斯巴达女王,也是Helen和Pollux的母亲,被宙斯封为天鹅座。
  它由Kowal由1974年发现。
  木卫十三,木卫十二和木卫九属于太阳系中最小的卫星。
  Himalia
  木卫六
  Himalia 是距木星第十近卫星:
  公转轨道:  距木星11,480,000 千米
  卫星直径:  186 千米
  质量:  9.56e18 千克
  Himalia是一位为宙斯(木星)生了三个儿子的仙女。
  它由Perrine于1904年发现。
  不像内层卫星,木卫十三、木卫六、木卫十、木卫七的轨道与木星的赤道面有值得注意的约28度的倾斜。
  Lysithea
  木卫十
  Lysithea 是距木星第十一近卫星:
  公转轨道:  距木星11,720,000 千米
  卫星直径:  36 千米
  质量:  7.77e16 千克
  Lysithea是大洋神俄亥阿诺斯神的女儿,也是宙斯神的情人之一。
  它由Nicholson于1938年发现。
  Elara
  木卫七
  Elara 是距木星第十二近卫星:
  公转轨道:  距木星11,737,000 千米
  卫星直径:  76 千米
  质量:  7.77e17 千克
  Elara与宙斯生下了巨人Tityus。
  它由Perrine于1905年发现。
  木卫十三、木卫六、木卫十、木卫七可能是一颗小行星的残留物质,由于木星的吸引而被俘获。
  Ananke
  木卫十二
  Ananke 是距木星第十三近的卫星:
  公转轨道:  距木星21,200,000 千米
  卫星直径:  30 千米
  质量:  3.82e16 千克
  Ananke和宙斯生下了Adrastea。
  它由Nicholson于1951年发现。
  木卫十二、木卫十一、木卫八、木卫九有不寻常但类似的轨道。
  Carme
  木卫十一
  Carme 是距木星第十四颗卫星:
  公转轨道:  距木星22,600,000 千米
  卫星直径:  40 千米
  质量:  9.56e16 千克
  Carme与宙斯生下了Cretan女神Britomartis。
  它由Nicholson于1938年发现。
  木卫十二、木卫十一、木卫八、木卫九的轨道不同寻常,是逆向的。
  Pasiphae
  木卫八
  Pasiphae 是距木星第十五颗卫星:
  公转轨道:  距木星23,500,000 千米
  卫星直径:  50 千米
  质量:  1.91e17 千克
  Pasiphae是米诺斯的母亲,与一头白公牛生下了人身牛头怪物弥诺陶洛斯。
  它由P. Melotte于1908年发现。
  木卫十二、木卫十一、木卫八、木卫九与木星的赤道面有大约150度的倾斜。
  Sinope
  木卫九
  Sinope 是木星最外层卫星:
  公转轨道:  距木星23,700,000 千米
  卫星直径:  36 千米
  质量:  7.77e16 千克
  Sinope是一位传说中未被宙斯成功追求到的女人。
  它由Nicholson于1914年发现。
  木卫十二、木卫十一、木卫八、木卫九有可能是一颗小行星的残余物质,由木星的引力俘获。

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Callisto 木卫四(中)

Callisto 是距木星第八近已知卫星,直径上看为第二大。在伽利略发现的卫星中距木星最远。
  公转轨道: 距木星1,883,000 千米
  卫星直径: 4800 千米
  质量: 1.08e23 千克
  Callisto是一位被宙斯所爱,而又为赫拉所嫉恨的仙女。赫拉将她变为了一头熊,宙斯便把她放到了天上,成为北斗七星。
  它由伽利略和Marius于1610年发现。
  木卫四比水星稍许小一些,但只是其质量的三分之一。
  不像木卫三,木卫四的内部结构近乎没有;它一律由或多或少的40%的冰与60%的岩石或铁组成。这与土卫六和海卫一可能相似。
  木卫四的表面都是环形山,表面十分古老,就像月球和火星上的高原。木卫四有太阳系中所观察到的星体中最古老的表面环形山最多的地表;在漫长的40亿年中,除偶然的撞击之外只有很小的变动。
  较大的一些环形山周围围绕着一串同心环 ,就像裂痕一般,不过经过岁月的苍桑,冰的缓慢运动,已使它平滑了不少。其中最大的一个被称作Valhalla,直径4000千米,并是多环盆地,猛烈撞击后产生的典型例子。另一些例子为木卫四的“仙宫”(Asgard),月球表面阴暗部的Orientale和水星上的Caloris盆地。
  与木卫三相似,木卫四的古老的环形山已经崩溃。它们缺少月球和水星上所有的高大的环状的连山,放射状射线和中央洼地。来自伽利略号的清晰图片显示,至少在某些地区,小型环形山已消失。这说明一些运动正在进行中,不管其他的是否在衰落过程中。
  另一个奇特的地形现象是Gipul Catena,一系列撞击出的环形山在一条直线上排列。这可能由于一个物体在接近木星时受引力而断裂(与苏梅克列维9号彗星极相似),然后撞向了木卫四引起。
  伽利略号没有发现它的磁场的证据。
  与木卫三不同的是,它有复杂的地形,但木卫四上的地壳运动证据颇少。它的大多数性质与木卫三相同,所以它应有一个与木卫三类似的地理历史。这两颗卫星的不同地理历史是行星科学的重要难题。(这可能与木卫三的轨道与引潮力变化有关)“简单”地看,木卫四是其他复杂星球比较时的理想参考,它也可能可以告诉我们其他伽利略发现的卫星的早期历史的情况。

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回复:木卫的外层卫星(中英)

Callisto is the eighth of Jupiter's known satellites and the second largest. It is the outermost of the Galilean moons.

  orbit: 1,883,000 km from Jupiter

  diameter: 4800 km

  mass: 1.08e23 kg

  Callisto was a nymph, beloved of Zeus and hated by Hera. Hera changed her into a bear and Zeus then placed her in the sky as the constellation Ursa Major.

  Discovered by Galileo and Marius in 1610.

  Callisto is only slightly smaller than Mercury but only a third of its mass.

  Unlike Ganymede, Callisto seems to have little internal structure; however there are signs from recent Galileo data that the interior materials have settled partially, with the percentage of rock increasing toward the center. Callisto is about 40% ice and 60% rock/iron. Titan and Triton are probably similar.

  Callisto's surface is covered entirely with craters. The surface is very old, like the highlands of the Moon and Mars. Callisto has the oldest, most cratered surface of any body yet observed in the solar system; having undergone little change other than the occasional impact for 4 billion years.

  The largest craters are surrounded by a series of concentric rings which look like huge cracks but which have been smoothed out by eons of slow movement of the ice. The largest of these has been named Valhalla. Nearly 3000 km in diameter, Valhalla is a dramatic example of a multi-ring basin, the result of a massive impact. Other examples are Callisto's Asgard, Mare Orientale on the Moon and Caloris Basin on Mercury.

  Like Ganymede, Callisto's ancient craters have collapsed. They lack the high ring mountains, radial rays and central depressions common to craters on the Moon and Mercury. Detailed images from Galileo show that, in some areas at least, small craters have mostly been obliterated. This suggests that some processes have been at work more recently, even if its just slumping.

  Another interesting feature is Gipul Catena, a long series of impact craters lined up in a straight line. This was probably caused by an object that was tidally disrupted as it passed close to Jupiter (much like Comet SL 9) and then impacted on Callisto.

  Callisto has a very tenuous atmosphere composed of carbon dioxide.

  Galileo has detected evidence of a weak magnetic field which may indicate some sort of salty fluid below the surface.

  Unlike Ganymede, with its complex terrains, there is little evidence of tectonic activity on Callisto. While Callisto is very similar in bulk properties to Ganymede, it apparently has a much simpler geologic history. The different geologic histories of the two has been an important problem for planetary scientists; (it may be related to the orbital and tidal evolution of Ganymede). "Simple" Callisto is a good reference for comparison with other more complex worlds and it may represent what the other Galilean moons were like early in their history.

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回复:木卫的外层卫星(中英)

Ganymede 为最大的木星已知卫星,也是第七颗发现的木星卫星,在伽利略发现的卫星中离木星第三近。

  公转轨道: 距离木星 1,070,000 千米

  卫星直径: 5262 千米

  质量: 1.48e23 千克

  Ganymede是一个特洛伊美人的男孩,被宙斯带去给众神斟酒。

  木卫三被伽利略和Marius于1610年发现。

  木卫三是太阳系中最大的卫星,直径比水星大,但质量是它的一半。木卫三比冥王星大得多。

  在伽利略号接触木卫三之前,普遍认为它与木卫四是一块石质物质外包一个大的水或冰水混合物作为地幔,并有一个冰外壳(这与土卫六和海卫一相似)。来自伽利略号的初步数据提议木卫四有一个独一无二的组成成份,而木卫三则有三个层结构:一个小型的铁或铁硫化物内核,外面是硅酸盐岩石地幔,最外部是冰质外壳。事实上,木卫三除了一个冰外壳外,与木卫一极相似。

  木卫三的表面很粗糙,混有两种地形:非常古老,陨坑遍布的黑暗区,和相对年轻的有着大片凹槽和山脊的较明亮地区。它们的起源很显然不过是因为自然构造的,但详情不很清楚。在这方面,木卫三可能与地球,及金星或火星类似(虽然近期没有地壳活动的证据)。

  哈博望远镜发现了木卫三有稀薄的含氧大气的证据,与木卫二上发现的极相似。(这绝对不是有生命的证据)。

  类似的凹槽与山脊的地形在土卫二,天卫五和天卫一也可见。黑暗区则与木卫四的表面相似。

  两种地形上都有延伸的环形山,环形山的密集程度反映它已有了30-35亿的年龄,与月球并不多。环形山有时为凹槽所切断,说明凹槽也很古老。相当年轻的环形山通过发出的光线也可被看到。

  但是它不像月球,陨坑都较平,缺少环状的山相围,中央洼地则通常与月球和水星上的相同。这可能是由于木卫三的冰外壳较脆弱,使地质流动而缺少起伏的缘故。古老的环形山被逐渐抹去,常被称作“覆画”。

  伽利略号飞行器第一次飞经木卫三时发现它有自己的磁场,内含于木星巨磁场中。这可能与地球的生成原因类似:星体内部物质运动的结果。

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