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VOCABULARY irregular – does not have an even or symmetrical shape; does not have a formal pattern Synonym: uneven His teeth were not even or straight, so the dentist said they were irregular and needed braces. minor – lesser in size or importance Synonym: secondary Antonym: major Asteroids are called minor planets because they are not as big as regular planets like Earth and Jupiter. composed –made or formed by combining things, parts, or elements Synonym: created Antonym: decomposed taken apart Comets are composed, or made up of ice, dust and gasses. elliptical – having the form of an ellipse Synonym: egg-shaped oblong Comets orbit the sun in large elliptical orbits. vaporize – turn to vapor (mist, steam, or gas) Synonym: evaporate If you vaporize a liquid or solid, it means you changed it into a vapor or gas. coma – the hazy cloud around the nucleus of a comet The coma of a comet surrounds the nucleus. nucleus – the center or core Synonym: inside The nucleus of an atom or cell is the central pat of it. visible – can be seen Synonym: observable viewable The siren’s lights were clearly visible.