How many moons does Jupiter have?
木星有多少颗卫星？
While Venus and Mercury have no moons, Mars has two, while Saturn and Jupiter have more than 60 each.
尽管金星和水星没有卫星，火星却有两个卫星，更别提各有超过60个卫星的土星和木星。
Our galaxy is so huge that dozens of lesser galaxies scamper about it, like moons orbiting a giant planet.
我们的银河系实在庞大，吸引着数十个较小的星系环绕着它奔跑，恰似环绕巨大行星旋转的卫星。
As Europa orbits its planet, however, it flexes due to the gravitational tug-of-war between it, its sister moons, and Jupiter.
然而，当木卫二绕其行星运行时，由于姊妹卫星和木星之间的引力拉锯战，它会弯曲。
While the moons' rapid rotation would be enough to squash them into a smooth oval, it can't explain the rim around the centre of the saucer shape.
虽然卫星的快速旋转足以将它们挤压成一个光滑的椭圆形，但它无法解释碟形中心的边缘。
The Mariner spacecraft found that the surface of Mars, as well as that of its two moons, is pitted with impact craters formed by meteoroids falling in from space.
水手号宇宙飞船发现火星表面，还有它的两个卫星表面，都有由太空坠落的流星体造成的陨石坑。
Massive projectiles striking much larger bodies create various kinds of craters, including multi-ring basins—the largest geologic features observed on planets and moons.
巨大的抛射物撞击更大的天体，创造了各种各样的陨石坑，包括多环盆地——这是在行星和卫星上观察到的最大的地质特征。
Massive projectiles striking much larger bodies create various kinds of craters, including "multi-ring basins"—the largest geologic features observed on planets and moons.
大量的抛射物撞击更大的天体，形成各种各样的陨石坑，包括“多环盆地”——在行星和卫星上观察到的最大的地质特征。
Just like moons and like SUNS.
就像月亮太阳。
Europa and Ganymede are moons of Jupiter.
Europa和Ganymede是木星的卫星。
They could look at the spectra of the light the moons reflected.
他们可以观察月亮反射的光的光谱。
Janus is one of Saturn's smaller moons and measures only about 180 kilometers across.
土卫十是土星小卫星之一，据测直径只有180千米左右。
The orbits comets take sometimes end with them colliding with planets and their moons.
一些在轨彗星有时会以与行星或其卫星发生碰撞的形式走向终结。
Two of Saturn's 48 known moons are barely visible in this picture of the ringed planet.
目前已知，土星有48个卫星。其中的两个在此环形星球的照片上依稀可见。
The two countries announced a joint effort to explore Mars and one of its moons in 2009.
两国共同签署了《中国国家航天局和俄罗斯联邦航天局关于联合探测火星-火卫一合作的协议》，并确定双方将于2009年联合对火星及其卫星“火卫一”进行探测。
Such threats seemed many miles and moons from the clear, clean water of central Idaho.
对爱达荷州中部清澈而干净河水来讲，如此的威胁似乎非常遥远。
He would go on to discover another of Saturnian satellite as well as two of Uranus's moons.
后来，赫歇尔发现了另一颗土星的卫星，以及天王星的两颗卫星。
NASA has reported that there is no such thing as two moons showing in the skies over the world.
美国航天局报告说，从来没有世界各地天空中同时出现两个月亮这样的事情。
Rhea, one of Saturn's larger moons, was caught passing Epimetheus, one of Saturn's smaller moons.
土卫五，土星的大卫星之一，被抓拍到经过土卫十一，土星的一颗小卫星。
The discovery may explain a long-standing mystery surrounding another of Saturn's moons, Iapetus.
这个光环的发现或许有助于解释关于土星另一卫星“土卫八”（Iapetus，又译为亚佩特斯）的一个古老而神秘的谜。
PLANETRISE: In an artist's conception, rocky moons orbit a gas giant in a distant planetary system.
行星升起：在艺术家的想像图中，在一个遥远的行星系统内，一颗岩石卫星围绕一颗气体行星旋转。
A thick, fibrous fog had transformed the trees into ghosts and the streetlights into soft, haloed moons.
浓密厚重的雾使树木看起来像鬼魂，街灯看起来像是带着柔和光晕的月亮。
From a billion miles away, the Cassini spacecraft continues to send spectacular images of Saturn and its moons.
卡西尼号探测器从几十亿公里以外的太空将土星和其卫星的壮观影像不断传回地球来。
The collision would have taken place during the late stages of the theoretical proto-moons' cooling process.
碰撞有可能发生在理论上存在的两个“原月亮”冷却的最后阶段。
Do we have an ethical duty to respect and preserve the natural environments of neighboring planets and their moons?
我们有一个道德义务，尊重并维护邻近行星及其卫星的自然环境吗？
Two of Saturn's moons present a sharp contrast in a picture snapped by the Cassini spacecraft and released June 21.
6月21日公布的卡西尼号飞船所拍摄的一张照片里，两个土星的卫星形成了鲜明的对比。
The named moons of the solar system outnumber planets by more than 20 to 1, and they display a remarkable diversity.
太阳系已命名的卫星数量和已命名的行星数量比例要大于20：1。
The named moons of the solar system outnumber planets by more than 20 to 1, and they display a remarkable diversity.
太阳系已命名的卫星数量和已命名的行星数量比例要大于20：1。
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