The Galaxy consists of 100 billion stars.

银河系由1千亿颗恒星组成。

Astronomers have discovered a distant galaxy.

天文学家们发现了一个遥远的星系。

At least one supernova occurs per decade in our galaxy.

每十年至少有一颗超新星在我们的银河系中出现。

From this you can calculate the total mass in the Galaxy.

据此，你可以计算出银河系的总质量。

Within our own galaxy there are probably tens of thousands of planetary systems.

在我们所在的银河系中，很可能存在数以万计的行星系。

Is this one galaxy or two?

这是一个星系还是两个？

The three spiky stars are in our own Milky Way galaxy.

这三颗尖尖的恒星位于我们的银河系。

These stars vastly outnumber the other stars in a given galaxy.

在一个给定的星系中，这些恒星的数量远远超过其他恒星。

How many of you have seen the Milky Way, the Milky Galaxy in the sky?

你们有多少人见过银河，天上的银河系？

Almost every fuzzy yellow patch in the above image is an entire galaxy.

上图中几乎每一个模糊的黄色斑块都是一个完整的星系。

Light from stars, even nearby in our own galaxy, doesn't stand a chance against that.

即使是我们银河系附近的恒星发出的光，也无法与之抗衡。

"The galaxy has an inner clutch of rocky, sort of terrestrial-like planets," Butler says.

巴特勒说：“这个星系内部有一堆岩石，有点像类地行星。”

The hapless, mangled galaxy may have once looked more like our Milky Way, a pinwheel-shaped galaxy.

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 Cartwheel Galaxy shows a ring that is the result of a collision between a small and a large galaxy.

车轮星系呈现出一个由大小两个星系碰撞而形成的光环。

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。

Observations indicate that gas clouds in galaxy M87 are whirling unusually fast about the galaxy's center.

观测表明 M87 星系的气体云围绕星系中心旋转的速度异常快。

Apple Home Pod has Siri, Google Home has its Assistant, and the upcoming Galaxy Home device will have Bixby.

Apple Home Pod 有 Siri，谷歌 Home 有助手，而即将推出的 Galaxy Home 设备将配备 Bixby。

According to previous speculation, these strands were gases that had been blown out by an explosion in the galaxy.

根据先前的推测，这些气体束是在一次星系的爆炸中炸出来的。

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?

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？

The physicist Fabian reasoned that as intergalactic gas cools, the cooler gas shrinks inward toward the center of the galaxy.

物理学家费边推断，当星系间的气体冷却时，较冷的气体向星系中心收缩。

Nicknamed the Southern Pinwheel, M83 is undergoing more rapid star formation than our own Milky Way galaxy, especially in its nucleus.

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。

In fact, 24 per cent of our galaxy elemental mass consists of helium, which makes it the second most abundant element in our universe.

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。

If many such chains were created in a differentially rotating galaxy, the distribution of stars would resemble the observed distribution in a spiral galaxy.

如果许多这样的链是在一个不同的旋转星系中产生的，那么恒星的分布将类似于在螺旋星系中观察到的分布。

Meanwhile, its place is taken by hotter intergalactic gas from farther out on the edge of the galaxy, which cools as it is compressed and flows into the galaxy.

与此同时，它的位置被更热的星系间气体所取代，这些气体来自更远的星系边缘，在被压缩的过程中冷却并流入星系。

Upwards of a billion stars in our galaxy have burnt up their internal energy sources, and so can no longer produce the heat a star needs to oppose the inward force of gravity.

在我们的星系中，超过10亿颗恒星已经耗尽了它们的内部能量来源，因此无法再产生恒星所需的热量来对抗向内的引力。

The net result is a continuous flow of gas, starting as hot gases in intergalactic space and ending as a drizzle of cool gas called a "cooling flow," falling into the central galaxy.

最终的结果是一股持续的气体流，开始是星系间的热气体，结束时是一股被称为“冷却流”的少量冷气体，落入星系中央。

Since the lifetime of a planet like ours is several billion years, we can expect that, if other civilisations do survive in our galaxy, their ages will range from zero to several billion years.

由于我们这样的行星的寿命是几十亿年，我们可以预测，如果我们星系中有其他生物生存，它们的年龄将从零到几十亿岁不等。

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.

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。

A landmark in the history of science was made by a photo which was taken on April 10th about the black hole in a faraway galaxy.

4月10日，一张遥远银河上黑洞的照片成为科学史上的一座里程碑。

This line of reasoning underlies an exciting new theory of spiral-galaxy structure.

这一推理路线是一个令人兴奋的螺旋星系结构新理论的基础。