21 The Mysterious Starry Sky21神秘星空 On a clear night, we can look at a white band of light like a light cloud and mist in the sky, dotted with stars.晴朗的夜晚,我们可以在天空中看繁星点缀下有一条淡云薄雾般的白色光带。 It is like a mysterious veil for the sky, leaving us with endless imagination...它就像给天空戴上了一条神秘的纱巾,留给我们无限的遐想… That white band is the Milky Way.那条白色的带子就是银河, What's in it?银河里有什么? Enter the mysterious Milky Way.走进神秘的银河系。 The Spiral Arm旋臂 The spiral arms旋臂 Solar System太阳系 Silver nucleus银核 Side view of the Milky Way银河系侧视图 The Milky Way is a vast disk-shaped system of stars, nebulae, star clusters and other interstellar material银河系是由恒星,星云、星团及其他星际物质组成的巨大的盘状天体系统。 The galaxy is about 70,000 light-years in diameter, and the Sun system is located on a spiral arm 23,000 light-years from the nucleus. 银河系直径约7万光年,大阳系位于距银核2.3万光年的旋臂上。 The many stars in the Milky Way form an irregularly shaped luminous belt around the night sky.银河亲中的多星体形成了环绕夜空的、外形不规则的发光带。 Information card资料卡 Distances on Earth are usually expressed in kilometres, but the distances between stars are so Astronomy therefore uses the light-year as a unit of distance. far apart that it is impractical to express them in kilometres.地球上的距离通常是用千米来表示的,但是星体间的距离实在太遥远了, 因此,天文学上用光年作为距离单位。用千米表示就显得不实用了。 In space, light travels at about 300,000 kilometres per second, so one light year is the distance travelled by light in one year - about 9.5 trillion kilometres. 在太空中,光以每秒约30万千米的速度传播,1光年就是光在1年中所走的距离,约为9.5万亿千米。 Our sun is just one of the very ordinary members of the galaxy.我们的太阳只是其中一个The shape of the Milky Way galaxy...很普通的成员 The shape of the Milky Way galaxy...银河系的形状… 银河系由一千多亿颗像太阳一样的恒星组成 Why do we see the Milky Way galaxy as a ribbon?为什么我们看到的银河系像一条带子? How long would it take to travel 70,000 light years?走7万光年的路程,需要多长时间? 1. If you travel by train at a speed of 120 km/h, it takes ( )如果乘坐时速120千米的火车,需要（ ） 2. If you travel by air at 800 km/h, it takes ( )如果乘坐时速800千米的飞机,需要（ ） 3. If you travel by air at 40,000 km/h, it will take ( ) 3.如果乘坐时速40000千米的飞船,需要（ ） Let me calculate question 1.我来计算第1题。 Let me calculate question 3.我来计算第3题。 The vastness of the universe浩瀚的宇宙 There are many more celestial systems like the Milky Way像银河系这样的天体系统还许多 The Universe is so big!宇宙这麽大啊 Using the most advanced astronomical telescopes, we can see galaxies that are tens of billions of light-years away from us. Now, scientists have discovered more than a billion star systems as large as the Milky Way, known as 'extragalactic galaxies',现在，科学家们已经发现了十亿多个和银河系同样庞大的恒星系统,利用最先进的天文望远镜,我们能够看到离我们上百亿光年的星系。 but there are many more, more distant 'extragalactic galaxies' yet to be discovered!即“河外星系”,但是还有更多、更遥远的“河外星系”没有被发现呢! Information Cards资料卡 I have collected images of other galaxies我搜集到了有关其他星系的图片 Elliptical galaxies (Centaurus A)椭圆星系(半人马座A) Irregular galaxies不规则星系 Wheel galaxies车轮星系 Let's be mindful and continue to look at the infinite universe.让我们做个有心人,继续关注无垠的宇宙。 |
Powered by Discuz! X3.4
Copyright © 2001-2020, Tencent Cloud.
