orbit - the path an object takes around another object in space, Galileo - first to study the night sky using a telescope. (sun-centered), Copernicus - first suggested the earth revolves around the sun, axis - imaginary line through earth from the north to south poles, hemisphere - one-half of earth, revolve - earth does this once a year around the sun, rotate - earth's spinning in space, moon - earth's satellite, gravity - keeps the moon in orbit around earth, moon phases - changes in the appearance of the moons shape, waxing - moon appears to be getting bigger, waning - moon appears to be getting smaller, solar system - made up of a star and the planets and other bodies that revolve around it, planet - large round body that revolves around a star in a clear orbit, dwarf planet - nearly round bodies whose orbits cross those of other bodies, comet - ball of rock and frozen gases with a fiery tail, inner planets - planets closest to the sun, outer planets - planets farthest away from the sun, asteroids - large rocks left over from when the solar system was formed, star - huge ball of hot glowing gases, astronomy - study of objects in space and their characteristics, sun - medium sized yellow star at the center of our solar system, galaxy - group of billions of stars, the objects that orbit the stars, gas, and dust, universe - everything that exists, rover - a vehicle that moves across a planet's surface, telescope - a tool that magnifies distant objects,

Earth and Space Vocabulary

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