cluster - a number of the same things that are together in a group, frigid - extremely cold, terrain - the surface of the land and its features, compressed - pressed together into less space, international - involving more than one country, theory - a suggested explanation for why something happens, data - facts of information that have been collected, often in measurements, irregular - uneven, not rirregular in shape, size, or other characteristics, tragedy - a very sad event or a disaster, debris - bits and pieces of leftover dust and rocks, logical - makes sense in an organized, step-by-step way, opposed - resisted; was against, expanding - becoming larger; increasing in area, eclipse - the blocking of the light from the sun or another celstial object, axis - an imaginary straight line through the middle of an object,

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