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,

ULS unit 23-Our Place in Space

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