atmosphere - The envelope of gases surrounding Earth or another planet., electric field - A region around a charged particle or object within which a force would be exerted on other charged particles or objects., gas giant - A giant planet that is made mostly of the gases helium and hydrogen, millisecond - A thousandth of a second, thermosphere - An upper region of the atmosphere that extends from 85 to 600 kilometers (53 to 372 miles) above Earth’s surface, molecule - An electrically neutral group of atoms that represents the smallest possible amount of a chemical compound,

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