The largest asteroid is Ceres, which is about a quarter the size of the moon.
最大的小行星是谷神星，其体积大约是月球的四分之一。
The earth is 49 times the size of the moon.
地球的大小是月球的四十九倍。
The same size of the moon or larger than that?
会与月球一样大，还是比它大些？
The Giant Impact Theory explains many aspects of lunar geology including the size of the Moon'score and the density and isotopic composition of moon rocks.
大碰撞假说能够解释月质学的许多方面内容，包括月球核心的大小、密度、月岩的同位素组分等。
Because radio waves are millions of times longer than visible light, a collecting dish of a 10-meter radio telescope might only resolve an area of sky the size of the moon.
由于无线电波比可见光波长百万倍，10米宽射电望远镜上的碟面只能接收月亮大小的星空图。
While 38 degrees seems like a big distance (it is around 80 times larger than the size of the moon), the Large Area Telescope on Fermi sees a huge fraction of the sky at once.
尽管38度似乎是一个很远的距离（月亮大小的80倍左右），费米航天器上的大范围望远镜却可以一次观察到特别大的一部分天空。
Try this trick, though: Using a pencil eraser or similar object held at arm's length, gauge the size of the moon when it's near the horizon and again later when it's higher up and seems smaller.
试一下这个小戏法：把一块橡皮或者相似的东西举起一臂长，在月亮接近地平线和后来升得更高看起来小一些的时候来测量它。
Perhaps in ten thousand years, the starry sky that humankind gazesupon will remain empty and silent, but perhaps tomorrow we'll wake up and findan alien spaceship the size of the moon parked in orbit.
也许再过一万年，人类注视的那片星空依旧空旷而寂静，但也许明天我们醒来就会发现地球轨道上停着一艘月球般大小的外星飞船。
According to the giant-impact hypothesis, the Moon was created during a collision between Earth and a large object about the size of Mars.
根据“巨型撞击假说”，月球是在地球和一个火星大小的物体相撞时形成的。
Adding to the oddities, in 1978 scientists announced they'd found a moon of Pluto—but one that's almost half its size, making it the largest moon in relation to its parent body.
更奇怪的是，在1978年科学家宣传他们发现了一颗冥王星的卫星，它的体积居然达到冥王星体积的一半，这颗卫星也就成为了已知卫星中与其母星体积相比最大的一颗。
The moon will be increasing in size over the weekend of September 10-11, to reach full moon status in Pisces, Monday, September 12.
9月10-11日的那个周末，月相越来越大，直至双鱼座的满月（9月12日，周一）。
Viewed from Earth, NGC 6744 is about two-thirds the size of a full moon, but it's so faint you can't see it without a backyard telescope.
从地球上看，NGC 6744的大小差不多等于三分之二个满月。可惜的是，由于太过昏暗，我们惟有通过后院式望远镜才能观测到它。
In one simulation, a planet with the mass of Neptune situated in the habitable zone of a star - not too hot, not too cold - was given a moon the size of Earth.
在一种模拟的情景中，一个与天王星大小差不多的行星处在一个星球的可栖居的地带，不冷不热，并且周围有一个地球大小的恒星。
Researchers believe that our moon was created when a giant object the size of Mars hit the early Earth, sending out a disc of debris orbiting our planet.
研究学者认为，我们的月球是在一个巨大如火星的物体撞击地球时形成的，碰撞产生圆形的碎屑沿着地球轨道飞行。
The Greeks had a fair idea of the size of the Earth and the distance to the moon, and so did the medievals who read their work.
希腊人对地球的大小和地月距离有所了解。中世纪的人熟读希腊人的书，同样也获得了这样的知识。
The map below shows the Apollo 11 crew's movement on the Moon can fit within the size of a soccer (football) field.
这幅地图下面显示，阿波罗11号宇航员曾获动过的地方仅相当于一个英式足球场大小。
Most scientists think the moon was born when a huge object roaming the inner solar system - something about the size of Mars - smashed into the embryonic Earth.
大部分科学家认为月球在一块徘徊在太阳系内，大小几近火星的巨型物体撞击原始地球后产生。
The survey covered an area of the sky 10 times the size of the full moon, and found hundreds of thousands of galaxies.
这项调查覆盖了10倍月亮大的天空区域，发现了成百上千个星系。
Do you have any idea how much it costs to build one the size of a moon?
你有什么想法多少成本来构建一个月亮一个的大小？
Pluto has a moon, Charon, half the size of the planet.
冥王星唯一的卫星卡戎，大小是冥王星的一半。
When the moon takes a bite-size chunk out of the sun, it's a partial solar eclipse.
如果月球挡住太阳的一小部分，会产生日偏食。
"Europa is about the size of our own moon," Hand explains.
韩德解释说：“木卫二的体积与月球差不多。”
The moon is about one-fourth the size of the Earth in diameter.
月球的直径大约是地球的四分之一。
The moon is about one-fourth the size of the Earth in diameter.
月球的直径大约是地球的四分之一。
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