day, the time from Sun up to Sun down when the Earth has light, Earth, the planet that people live on, moon, a big ball of dirt and rock that moves around the Earth, night, the time from Sun down to Sun up when the Earth is dark, orbit, to move around a star or planet, planet, a large, round object that moves around the Sun or another star, solar system, the Sun and the group of objects that move around it, space, the area past Earth’s atmosphere, star, an object in space that makes its own heat and light, Sun, the star at the center of our solar system.

Unit 23: Our Place in Space

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