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Astronauts the moon.
have already been to
No one has been to Mars yet, because Mars is very far away, much farther than the moon.
has been to
You can to information.
go online
search for
—Are there any astronauts in the
spaceship?
—No, there aren’t.
The No. 3 was successfully launched
Chang'e three lunar journey
earth n.地球
moon n.
月亮；月球
Space & Earth
How many planets are there in the solar system?
水星
金星
地球
火星
木星
土星
天王星
海王星
冥王星
news n.
新闻；消息
planet n.行星
model n.模型