solid, hard and firm, not liquid or gas, gas giant, a very large planet made mostly of gases, ice giant, a large, cold planet made of gases and icy materials, dust storm, strong winds that carry a lot of dust, gravity, the force that pulls things toward a planet, rotate, to turn around on an axis, orbit, to travel around a planet or the Sun, trap heat, to keep heat from escaping, frozen, changed into ice because of very low temperatures, methane, a gas found in the atmosphere of some planets, hydrogen, a very light gas found in giant planets

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