78 Light From Space-Mid

Light from Space FOCUS Question What kind of objects in the night sky give off light?

来自太空的光焦点问题夜空中什么样的物体会发光?

The Sun On a sunny day, it is bright and warm. The Sun gives off light that shines on Earth. The sunlight keeps us warm and gives us daylight. How does it do this? The Sun is a star. a giant ball of burning gas. The gas is so hot that it glows brightly.

太阳在晴朗的日子里，它是明亮和温暖的。 太阳发出的光照耀着地球。 阳光使我们温暖，给我们日照。 它是怎么做到的呢?太阳是一颗恒星。 一个巨大的燃烧气体球。 这种气体非常热，发出明亮的光。

Outside, you might see trees, flowers and animals. How can you see these things? Light from the Sun reflects, or bounces off them. Some of that light enters your eyes. Without sunlight, Earth would be dark. You wouldn't be able to see many things.

在外面，你可能会看到树、花和动物。 你怎么能看到这些东西? 来自太阳的光会反射或反射到它们身上。 一些光进入你的眼睛。 没有阳光，地球将是黑暗的。 你将看不到很多东西。

Stars The Sun is not the only object in the sky that gives off light. Look at the sky at night. You can see many tiny dots of light. Those twinkling lights in the night sky are stars. Each star gives off its own light.

太阳并不是天空中唯一发光的物体。 看夜晚的天空。你可以看到许多小光点。 夜空中闪烁的灯光是星星。 每颗恒星都发出自己的光。

Other stars do not look as bright as the Sun because they are so far away. Together, all of those stars make starlight on Earth. Do You Know? Long ago, sailors used only the stars to help them find their way. They would look at groups of stars, called constellations, to guide them.

其他恒星看起来没有太阳那么亮，因为它们太遥远了。 所有这些恒星共同构成了地球上的星光。 你知道吗?很久以前，水手们只依靠星星来指引方向。 他们会观察被称为星座的星群来指导他们。

The Moon If you are outside at night, you may notice something else bright in the night sky—the Moon! Even though the Moon looks bright in the sky, it does not make its own light.

如果你晚上在户外，你可能会注意到夜空中还有一些明亮的东西——月亮!虽然月亮在天空中看起来很亮，但它自己并不发光。