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the Sun and all the planets that move around it 开始学习
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a large round object in space that moves around a star 开始学习
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to move in a circle around something 开始学习
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the big star in the center of our solar system 开始学习
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the outside part of something 开始学习
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having the highest temperature 开始学习
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living things like plants, animals, and people 开始学习
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a very high natural place on land 开始学习
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a mountain that can explode with lava 开始学习
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white or gray shapes in the sky made of water 开始学习
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very strong wind and rain 开始学习
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round bands that go around a planet 开始学习
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very small pieces of dirt 开始学习
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very cold and covered with ice 开始学习
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having the lowest temperature 开始学习
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what we see with our eyes, like red or blue 开始学习
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how big or small something is 开始学习
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the closest planet to the Sun and the smallest one 开始学习
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the second planet from the Sun and the hottest planet 开始学习
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the third planet from the Sun; people, animals, and plants live here 开始学习
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the fourth planet trom the Sun; it is red and has a very big volcano 开始学习
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the fifth planet from the Sun and the biggest planet 开始学习
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the sixth planet from the Sun; it has beautiful rings around it 开始学习
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the seventh planet from the Sun; it is very cold and light blue 开始学习
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the eighth planet from the Sun; it is very windy and far from the Sun 开始学习
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a person who travels into space 开始学习
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the area outside Earth where planets and stars are 开始学习
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a vehicle that flies into space 开始学习
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an important job or task in space 开始学习
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a person who studies science 开始学习
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a person who works with numbers and calculations 开始学习
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a machine that stores and uses information 开始学习
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a spacecraft that travels to space and back 开始学习
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when an astronaut works outside a spacecraft in space 开始学习
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an object that moves around a planet (often made by people) 开始学习
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to send something (like a rocket) into space 开始学习
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a person who travels to discover new places 开始学习
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a group of people working together 开始学习
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machines and tools used to solve problems 开始学习
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