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Learn the new words.
goes around
go around
Seven other planets also go around the sun. _____(没有一人;没有一个; 一点儿也没有)of them has an ___________(环境) like that of the earth, so scientists do not think they will find life on them.
None
none of
environment
environment
The sun and its planets are called ________________ (星系;(尤指)太阳系).
the solar system
There are billions of (数以亿计的)stars in the_________ (星系), and our sun is only one of them.
Galaxy
galaxy
Scientists have also discovered many other galaxies in the __________ (宇宙).
universe
none
environment
that
solar
pron. 没有一人；没有
一个；一点儿也
没有
n. 环境
pron. 那；那个（指代
已被提及的事物）
adj. 太阳的；与太阳有
关的
Words and expressions
system
solar system