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Galaxy
星系
Can you believe that there are at least 100 billion galaxies in the universe? Yes, there are.
你相信宇宙中至少有1,000億個星系嗎？確實(shí)有。
Small galaxies have 10 billion stars and big galaxies have one trillion stars.
小型星系有100億顆恒星，而大型星系有10,000億顆恒星。
The universe must be really big!
所以，宇宙一定廣袤無垠！
Do you know what galaxies look like?
你知道星系的形狀嗎？
Some galaxies have elliptical shapes.
有些星系是橢圓形狀。
And some galaxies have spiral shapes.
有些星系是螺旋形狀。
The Milky Way is a spiral galaxy.
銀河系是螺旋星系。
These two shapes are the most common shapes of galaxies.
橢圓和螺旋這兩種形狀是最常見的星系形狀。
But some other galaxies have irregular shapes too.
但也有一些的星系的形狀是不規(guī)則的。
Can we observe galaxies? Yes!
我們能觀測星系嗎？當(dāng)然能！
We can see them if we use a really good telescope.
使用非常好的望遠(yuǎn)鏡就能看到它們。
