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。
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。
Two moons appearing at the same time happens only once every 1, 000 years and isn’t scheduled to reappear until 2287.
两个“月亮”同时出现的情况1000年才发生一次，2287年之前不会重新出现。
Earth may once have had two moons - the one that shines at night today had a smaller companion, according to a new theory.
据英国《每日邮报》8月3日报道：一项新的理论表明，如今在夜晚照耀地球的月亮曾经有一个“小伙伴”，它们一度共同绕地球运行。
Moons are rare in the inner solar system: Venus and Mercury don't have any, and Mars's two moons are tiny pebbles in comparison with ours.
在太阳系内的行星拥有的卫星是很少的，金星和水星没有卫星，火星有两颗卫星，但跟我们的比起来就像是小小的鹅卵石。
And poet Todd Davis, a professor of literature at Penn State University, said this idea of two moons - one essentially swallowing the other - will capture the literary imagination.
宾夕法尼亚州立大学文学教授兼诗人托德·戴维斯称，双月的画面——大月亮最终吞噬小月亮——这样的画面将俘获文人们的心。
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。
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 moon, Mars, Venus, two asteroids and even one of the moons of Saturn have all received the attentions of landing craft.
月球、火星、金星、两个小行星、甚至连土星的卫星之一都已接受过登陆飞船的光顾。
A big moon likely could have helped stabilize Mars' orbit, but the planet has just two small moons, most likely captured asteroids, that don't have much gravitational muscle.
一个月亮很可能帮助稳定火星的轨道，但是它也有两个小的卫星，很可能是被捕获的小行星，他们根本就没有足够的引力能束缚。
A view with two of the more famous moons of Saturn in gibbous phase was captured last month by the robot spacecraft Cassini now orbiting Saturn.
上个月，在土星轨道上的宇宙飞船卡西尼号拍的这张照片，捕捉到土星著名的卫星中的两个，呈凸圆相位。
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。
Moons are generally thought to form in one of two ways - either by coalescing from the same cloud of debris as their parent planet, or as wandering objects captured by the parent's gravitational pull.
卫星通常被认为形成于两种途径：一是由它们母星的同性云状碎片合并而成，一是被母星重力抓住的游离天体。
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。
Two of Saturn's moons appear to form a conjoined world in an image from NASA's Cassini orbiter released September 24.
在九月二十四号美国国家航空航天局卡西尼轨道飞行器公布的一张图像中，土星的两个卫星似乎组成了一个连在一起的领域。
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。
You might miss a moon or two on occasion, because these moons routinely swing in front and in back of Jupiter.
有时你会错过一个或两个卫星，那是因为卫星绕木星例行旋转于木星之前或之后。
Saturn's famous rings are visible along with two of its moons, Rhea and Dione which appear as faint dots in the right and lower right part of the picture.
从图中我们可以看到有名的土星光环和右下方的两个暗点，即瑞亚和狄俄涅卫星。
It's unusual to have two new moons in a row falling in the same part of the chart, but that's what we have here.
虽然在星盘上同一个部分连续出现两次新月的情况不多见，但是这正发生在我们身上。
This year's solstice is particularly powerful, not least because it coincides with the first of two New Moons in your sign.
今年的夏至日有特别强大力量，不仅仅是因为有两个新月出现。
Besides, our histories of six thousand moons make no mention of any other regions, than the two great empires of Lilliput and Blefuscu.
还有，在咱们六千月的历史中，除去利立浦特与布莱夫斯库以外，没有关于其他地域的记录。
When Dr Koechlin and his team pointed 12 it at Mars they could distinguish that planet's two tiny moons-a task which would require a Newtonian telescope with a mirror at least 30cm across.
当凯什兰博士和他的团队观测火星时，他们可以分辨火星的两个微小卫星——这样的任务如果是利用牛顿的望远镜则需要一个直径最少长达30厘米的镜面。
When Dr Koechlin and his team pointed 12 it at Mars they could distinguish that planet's two tiny moons-a task which would require a Newtonian telescope with a mirror at least 30cm across.
当凯什兰博士和他的团队观测火星时，他们可以分辨火星的两个微小卫星——这样的任务如果是利用牛顿的望远镜则需要一个直径最少长达30厘米的镜面。
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