Correct: Universe , Terrestrial Planet , Solar System , Planet, Orbit , Nebula , Light-year , Gas Giant, Galaxy, Geocentric , Heliocentric, Dwarf planet , Big Bang Theory , Inner Planets, Outer Planets , Neptune's distance from the sun, Earth distance from the sun, Mercury distance from the sun, Inner planets have these characteristics, Outer planets have these characteristics, Incorrect: Space and all the matter and energy in it., One of the highly dense planets nearest to the sun; Mercury, Venus, Mars and Earth., The sun and all of the planets and other bodies that travel around it., A relatively large spherical body that orbits a star., The path that a body follows as it travels around another body in space., A large cloud of gas and dust in interstellar space; a region in space where stars are born. , The distance that light travels in one year; about 9.46 trillion kilometers, A planet that has a deep, massive atmosphere, such as Jupiter, Saturn, Uranus, or Neptune, A collection of stars, dust, and gas bound together by gravity., Describes something that uses Earth as the reference point. , Sun-centered , A celestial body that orbits the sun, is round because of its own gravity, but has not cleared its orbital path. , The theory that all matter and energy in the universe was compressed into a an extremely small volume that 13 billion to 15 billion years ago exploded and began expanding in all directions. , Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune , 30 AU, 1 AU , 0.3 AU, Rocky surface, closer to sun, small, revolves (go around) quickly around the sun., Long years, thick atmosphere, many moons, colder, far from sun, and have rings.,

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