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The main idea : The moon is the Earth's only natural satellite

Supporting Sentence : It is the brightest object in the night sky and the second-brightest object seen from Earth after the Sun. People observe and study the Moon for science, culture, and exploration

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The main idea : The Moon orbits the Earth once every 27.3 days

Supporting Sentence : It also rotates on its axis in the period, so people on Earth always see the same side of the Moon. The phases of the Moon, such as new moon, crescent, half moon and full moon, appear because of the position of the sun, Earth, and Moon

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The main idea : Its gravity causes earth ocean tides

Supporting Sentence : The Moon gives important effects to Earth. Its gravity causes ocean tides, which influence nature and human activity. It also keeps the Earth's rotation stable, so the climate stay balanced. The Moon is also a cultural symbol that inspires myths, legends, stories, and art.

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The main idea : The Moon shows several natural phenomena

Supporting Sentence : A lunar eclipse happens when the Earth blocks sunlight from reaching the Moon. A solar eclipse happens when the Moon passes between the Sun and the Earth, covering the Sun's light. The Moon also shows phases, such as new moon, crescent, half moon, and full moon, because of its orbit around Earth. Sometimes people see a supermoon, which appears larger and brighter because the Moon is closer to Earth. Another phenomenon is a blood moon, when the Moon looks red during a total lunar eclipse

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The main idea : The Moon is about 3,474 kilometers in diameter.

Supporting Sentence : which is one-fourth the size of Earth. Its distance from Earth is about 384,400 kilometers. The surface of the Moon is rocky and full of mountains, valley, and craters from asteroid impacts. The Moon does not have atmosphere or liquid water, so the temperature changes extremely between day and nighy

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The main idea : The Moon is not only a bright object in the sky

Supporting Sentence : It is Earth's nearest space neighbor, and it plays an important role in nature, science, and human life.