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5. The cosmonauts were sent to the moon in the United States between 1969-1972, and they returned to the Earth with rock examples for researching, scientists learned more about the moon and the Earth.6. Most scientist believe that the object was as large as Mars hit the Earth early in its history and huge pieces of the Earth broke off, then these pieces went into orbit around the Earth and came together eventually formed the moon. 7. This “impact theory” explains many facts about the moon and the Earth. 8 For instance, the moon and the Earth are almost the same age about 4.4 and 4.5 billion years old. 8. The moon is very dry because the impact created so much heat that it dried up all the water. 9 The Earth has iron in its center, also the moon but it’s very little iron because the moon formed from lighter materials that make up the outer part of the Earth.
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