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astronaut
space travel
SPACE
space travel
solar system
astronaut
Mars
spaceship
space station
the earth
the moon
the sun
astronaut Mars spaceship the sun
space station
the earth the moon
用所给词的适当形式或首字母填空。
The earth and seven other _______(planet)
go around the sun.____(none) of the seven other planets has an ___________ (e) like that of the earth.The sun and its planets are called the ____________(solar system). There are billions
of stars in the Galaxy, and the sun is only one of them.
Scientists have __________(发现) many other
planets
None
environment
solar system
discovered
galaxies in the ________(宇宙).It's
___________ (不可能的) to imagine how large the universe is. Scientists have sent __________(spaceship) to the planet Mars. But no one has travelled far enough __________
(reach) other stars in our Galaxy. But,why has no one from other planets _______________
(communicate) with us? No one knows the answer.
universe