Dark side of the moon
You can watch the moon, but you can see only one side. You cannot see the other side from the earth. This other side is called the dark side of the moon.
In 1959, people see it for the first time. Soviets take pictures of it. Now, we have some new pictures. A NASA satellite takes them.
Difficult words: earth (our planet), satellite (a machine that goes to space).
You can read the original story and watch the video in the Level 3 section.
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