asteroid - one of thousands of rocky objects that move in orbits mostly between those of Mars and Jupiter and have diameters from a fraction of a mile to nearly 500 miles (800 kilometers), black hole - a heavenly body with such strong gravity that light cannot escape it and that is thought to be caused by the collapse of a massive star, comet - a small bright heavenly body that develops a cloudy tail as it moves in an orbit around the sun, dwarf planet - a heavenly body similar to a planet but too small to clear other objects from its orbit, Pluto - a celestial object that orbits the sun at an average distance of 3.7 million miles (5.9 million kilometers) and has a diameter of about 1500 miles (2300 kilometers) and is often considered one of the planets, galaxy - any one of the very large groups of stars that make up the universe, light-year - a unit of length in astronomy equal to the distance that light travels in one year or about 5.88 trillion miles (9.46 trillion kilometers), meteor - one of the small pieces of matter in the solar system that enter the earth's atmosphere where friction may cause them to glow and form a streak of light, Milky Way - a broad band of light that stretches across the sky and is caused by the light of a very great number of faint stars, moon - a smaller body that revolves around a planet, planet - any large heavenly body that orbits a star (as the sun), Mercury - the planet that is nearest the sun and has a diameter of about 3000 miles (4700 kilometers), Venus - the planet that is second in order of distance from the sun and has a diameter of about 7,500 miles (12,100 kilometers), Earth - the planet that is thirds in distance from the sun. The planet that we live on., Mars - the planet that is fourth in order of distance from the sun, is known for its redness, and has a diameter of about 4200 miles (6800 kilometers), Jupiter - the planet that is fifth in order of distance from the sun and is the largest of the planets with a diameter of about 89,000 miles (140,000 kilometers), Saturn - the planet that is sixth in distance from the sun and has a diameter of about 75,000 miles (120,000 kilometers), Uranus - the planet that is seventh in order of distance from the sun and has a diameter of about 32,000 miles (51,000 kilometers), Neptune - the planet that is eighth in order of distance from the sun and has a diameter of about 31,000 miles (50,000 kilometers), solar system - the sun and the planets, asteroids, comets, and meteors that revolve around it, star - any of the heavenly bodies except planets which are visible at night and look like fixed points of light, sun - the heavenly body in our solar system whose light makes our day and around which the planets revolve,

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