rotate - turn about an axis or a center, axis - an imaginary straight line through the middle of an object, around which that object spins, hemisphere - half of the sphere of Earth, eclipse - an event that occurs when one object in outer space blocks the sunlight reaching another object, orbit - the curved path something in space takes around another object in space; planets move in an orbit around the sun, satellite - a natural or man-made object that orbits a planet or smaller object, galaxy - a very large cluster of billions of stars, dust, and gas held together by gravity and separated from other star systems by a large amount of space, frigid - extremely cold, stream - to flow or trail, gravitational pull - the force that draws all objects in the universe toward each other, observatory - a place used to observe the sun, moon, stars, and outer space, solar system - the sun, other bodies like asteroids and meteors, and the planets that orbit the sun, pursue - to do what it takes to accomplish something, spacecraft - a crewed or uncrewed vehicle designed to travel into space for research and exploration, telescope - a tool that helps us see distant objects, like stars and planets, by magnifying them, space probe - an uncrewed spacecraft that explores space, constantly taking pictures, astronomer - a scientist who studies stars, planets, and outer space, crewed - carrying and operated by people, universe - all objects and matter in space including Earth and beyond,

Unit 5 Astronomy Vocabulary Grade 3

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