DK night sky explore nature with fun facts and activities《夜空》探索自然有趣的实践拖动

Looking at the night sky
仰望夜空
Wherever you live in the world, you can look up at the night sky and see the Moon and the twinkling stars. How many stars you see depends on the weather and where you are looking from.
无论你住在世界的任何地方，你都可以仰望夜空，看到月亮和闪烁的星星。你能看到多少星星取决于天气和你从哪里看。

Starry night
星空
It is best to look at the night sky outside, away from street and house lights, which can block out starlight. You will see the most stars from the countryside, where the sky is darkest. However, if you live in a city, you may still see plenty of stars.
最好看外面的夜空，远离街灯和家灯，因为街灯和家灯会挡住星光。你会在乡村看到最多的星星，那里的天空最暗。然而，如果你住在一个城市，你仍然可以看到很多星星。

What is a star?
什么是星星？
There are billions of stars in the Universe. Stars are gigantic balls of glowing gas, which live for millions and millions of years. There are two main gases inside a star—hydrogen and helium. A star uses its gases to produce heat and light. The Sun is a star, and we feel its heat and light on Earth.
宇宙中有数十亿颗恒星。恒星是由发光的气体组成的巨大球体，可以存在数百万年。恒星内部有两种主要气体：氢和氦。恒星利用气体产生热量和光。太阳是一颗恒星，我们在地球上感受到它的热和光。

Life of a star
星星的一生
Stars live for millions of years. As a star grows older, it changes. The Universe contains young, middle-aged, and old stars. The biggest stars are more than 1,700 times wider than the Sun, and the smallest stars are much smaller than Earth.
恒星可以存活数百万年。当一颗恒星变老时，它会改变。宇宙包含年轻、中年和老年恒星。最大的恒星比太阳宽1700多倍，最小的恒星比地球小得多。

Dots of light
光点
As we look into space, we see lots of twinkling dots of light. These are huge stars, but because they are so far away they just look like bright specks in a dark sky. It seems as if the Earth is inside a gigantic sphere covered in stars.
当我们观察太空时，我们看到许多闪烁的光点。这些是巨大的恒星，但因为它们离我们太远，所以看起来就像黑暗天空中的明亮斑点。地球似乎在一个覆盖着星星的巨大球体内。

Galaxies
星系
Stars exist together in gigantic groups called galaxies that spin and travel through space. Each galaxy holds many billions of stars, and there are billions of galaxies in the Universe. Between galaxies, there is empty space. There are four different galaxy shapes: spiral, elliptical, barred spiral, and irregular.
恒星以巨大的星系群共同存在，这些星系在太空中旋转和旅行。每个星系都有数十亿颗恒星，宇宙中也有数十亿个星系。在星系之间，有一个空的空间。有四种不同的星系形状：螺旋星系、椭圆星系、棒状螺旋星系和不规则星系。

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