DK全球视觉 one million things planet earth一百万件事之地球

OUR GALAXY
我们的银河系
The universe contains at least 100 billion galaxies, each with billions of stars—most of which probably have orbiting planets. Our own galaxy, the Milky Way, consists of about 500 billion stars, including all the ones that we can see in the night sky, as well as large clouds of gas and dust, some of which form new stars.
宇宙中至少有1000亿个星系,每个星系都有数十亿颗恒星,其中大部分可能都有绕轨道运行的行星。我们自己的星系,银河系,由大约5000亿颗恒星组成,包括我们在夜空中能看到的所有恒星,以及巨大的气体和尘埃云,其中一些形成了新的恒星。
The Milky Way is a flat disk with a central bulge and bright spiral arms. Our Sun is a medium- sized star in one of the spiral arms, about two-thirds of the way out from the center. From Earth, we look out across the galaxy’s disk, so the densely packed stars at its center look like a milky band of light across the night sky.
银河系是一个扁平的圆盘,中央有一个凸起和明亮的旋臂。我们的太阳是一颗中等大小的恒星,位于其中一个旋臂中,距离中心大约三分之二的距离。从地球上看去,我们可以看到星系盘的另一边,因此星系中心密集的恒星看起来就像是夜空中的一条银河光带。

HOT BLUE STAR
炽热的蓝星
Stars glow with color, just like hot steel. Some glow red-hot, while hotter ones like our Sun glow yellow. Many even hotter stars glow white-hot, but the hottest, brightest stars are an intense blue.
星星闪耀着颜色,就像炽热的钢铁。有些会发出红光,而像我们的太阳这样更热的会发出黄色的光。许多甚至更热的恒星发出白热的光芒,但最热、最亮的恒星是深蓝色。
As stars get older they cool down and change color. Most eventually swell up to form “red giants” of dispersing gas. Some of the very biggest stars end their lives in vast explosions called supernovas.
当星星变老时,它们会冷却并改变颜色。大多数最终会膨胀形成分散气体的“红巨人”。一些最大的恒星在被称为超新星的巨大爆炸中结束了它们的生命。

THE SOLAR SYSTEM
太阳系
The Sun is a vast ball of hot gas that formed from a spinning cloud of gas and dust about 4.6 billion years ago.
太阳是一个巨大的热气球,大约46亿年前由旋转的气体和尘埃云形成。
Some of this material spread out as a spinning disk, and clumped together to create the orbiting planets of the solar system.
其中一些物质以旋转圆盘的形式展开,聚集在一起形成了太阳系的轨道行星。

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