银河系由1千亿颗恒星组成。
每十年至少有一颗超新星在我们的银河系中出现。
在我们所在的银河系中，很可能存在数以万计的行星系。
Within our own galaxy there are probably tens of thousands of planetary systems.
为了解释这一点，他们假定银河系一定包含了大量无法探测到的不明物质。
To explain this, they hypothesize that galaxies must contain a great deal of missing matter which cannot be detected.
很高兴见到你，第一个已知的穿越银河系来到地球的旅行者。
It's a pleasure to meet you, the first-known trans-galactic visitor to Earth.
这三颗尖尖的恒星位于我们的银河系。
这些管道被认为是为灌溉地表而修建的运河系统。
The lines were thought to have been a system of canals that had been built to irrigate the surface.
即使是我们银河系附近的恒星发出的光，也无法与之抗衡。
Light from stars, even nearby in our own galaxy, doesn't stand a chance against that.
银河系中的超新星最有可能是大多数宇宙射线到达地球的来源。
Supernovas in the Milky Way are the likeliest source for most of the cosmic rays reaching Earth.
银河系是地球所在的星系，而我们大多数人从未见过它，这不是很奇怪吗？
Isn't that strange that the Milky Way is the galaxy that the planet earth is in, and most of us have never seen it?
这个不幸的、被破坏的星系可能曾经看起来更像我们的银河系，一个风车形状的星系。
The hapless, mangled galaxy may have once looked more like our Milky Way, a pinwheel-shaped galaxy.
事实上，银河系中24%的元素质量是由氦组成的，这使它成为宇宙中第二丰富的元素。
In fact, 24 per cent of our galaxy elemental mass consists of helium, which makes it the second most abundant element in our universe.
绰号“南方风车”的M83正在经历比我们银河系更快的恒星形成过程，特别是在它的核心。
Nicknamed the Southern Pinwheel, M83 is undergoing more rapid star formation than our own Milky Way galaxy, especially in its nucleus.
从一端到另一端，银河系布满星星的圆盘横跨12万光年，可以用肉眼和光学望远镜观察到。
From end to end, the Milky Way's starry disk, observable with the naked eye and through optical telescopes, spans 120,000 light-years.
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。
Our galaxy is so huge that dozens of lesser galaxies scamper about it, like moons orbiting a giant planet.
最近的发现有力地支持了这样一种理论，即银河系中心，和宇宙中估计存在的1000亿个其他星系中的许多里有一个黑洞。
Recent findings lend strong support to the theory that a black hole lies at the center of the Milky Way and of many of the 100 billion other galaxies estimated to exist in the universe.
出差几周前到这个国家旅游时，我在收音机上收听关于已故的英国作家道格拉斯·亚当斯的杰作《银河系漫游指南》的相关评论。
Traveling through the country a couple of weeks ago on business, I was listening to the talk of the late UK writer Douglas Adams' masterwork "The Hitchhiker's Guide to the Galaxy" on the radio.
银河系外的有些星体其光度超过太阳。
如,银河系漫游指南以及其续集
The Hitchhiker's Guide to the Galaxy and the sequels to that.
我们位于银河系边缘的偏远山区。
We have been located in a backwater part of the galactic rim.
我们知道在银河系内有几十亿颗行星。
We can tell in our galaxy there must be billions of planets.
飞驰通过银河系，比太阳的速度还快。
球状星团曾经统治着银河系。
与此相反，银河系边缘的星球却前途暗淡。
In contrast, prospects for planets at the galaxy's edge are bleak.
银河系星云是宇宙中通过重力相连的最大的物体。
Galaxy clusters are the largest objects bound by gravity in the universe.
天文学家宣布发现了首颗来自银河系以外的行星。
Astronomers claim to have discovered the first planet originating from outside our galaxy.
因此，研究球状星团可以向我们揭示银河系的历史。
Studying globular clusters therefore tells us about the history of our galaxy.
因此，研究球状星团可以向我们揭示银河系的历史。
Studyingglobular clusters therefore tells us about the history of our galaxy.
费米尔泡可能是由我们银河系中心的黑洞所驱动的。
The Fermi bubbles could be powered by the black hole at the center of our galaxy.
而且他们相信这种星体在银河系中和恒星一样常见。
They also believe such objects could be as common as stars are throughout the Milky Way.
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