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Milky Way
银河系
Do you know the Earth is in the universe?
你知道地球处在宇宙中吗？
The universe is really big.
宇宙广袤无垠。
If the universe is like a country, the Earth is like a small house.
如果把宇宙比作国家，那地球就像这个国家里的一间小房子。
The Earth and other planets circle around the sun.
地球和其他行星绕着太阳转。
This is called the solar system.
这就叫做太阳系。
The solar system is like a small town.
太阳系就像一座小镇。
And there are other stars near the solar system.
它附近还有其他恒星。
Those stars and our solar system make a galaxy.
那些恒星和太阳系共同组成一个星系。
The galaxy's name is the Milky Way.
这个星系称为银河系。
The Milky Way is a huge city of stars.
银河系是巨大的恒星城。
There are at least 200 billion stars in the Milky Way.
银河系里至少有两千亿颗恒星。
Is the Milky Way the only galaxy in the universe?
银河系是宇宙中唯一的星系吗？
No, there are billions of other galaxies too.
当然不是，宇宙中还有数十亿个星系。
