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About the Cover


The reflector of this radio-radar telescope, located in the hilly terrain south of Arecibo, Puerto, Rico, is 1000 feet in diameter and is suspended in a natural bowl. The triangular structure, held by cables from concrete towers, supports and positions the antenna feed that illuminates the reflector and steers the beam through a 40-degree cone centered overhead. See page 26.


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Science. ISSN 0036-8075 (print), 1095-9203 (online)