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。
What would it be like to see a sky with many moons?
要是空中有许多月亮会什么样？
The two moons are actually about 250,000 miles apart.
两颗卫星之间的实际距离为40万公里。
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。
When appearing close to each other, moons will show a similar phase.
如果卫星们位置相近，它们还会显示出相似的相位。
The above false-colored image spans three full moons from top to bottom.
上图是伪彩色照片，从上到下跨度约相当于三个满月（一度半）。
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。
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。
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