the Sun
the Sun gives us energy.太阳给我们能量。  90

the Moon
the light from the Moon comes from the Sun.月亮的光来自太阳

Earth
this is our planet, it goes around the Sun once a year.这是我们的星球，它每年绕太阳一周。

stars
we see stars as small points of light in the night sky.我们把星星看作夜空中的小光点。91

galaxy    /'ɡæləksi/ 
a galaxy has billions of stars.一个星系有数十亿颗恒星。
except for our own galaxy, they are very far away.除了我们自己的星系，它们非常遥远。88   /ɪkˈsept/ 

1）the Sun/ the Moon/ the earth/ the United States
前面都加了定冠词the,表示独一无二的事物
2）see sth. as sth.把...看做...
3）except for :除...之外，不包括...（后面只能跟名词或名词短语）