Word: flattish
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Dates: during 1960-1969
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...nibble away about 1¼ sq. in. of its skin per day. Eventually the sphere may collapse, pushed to a pancake by air drag and pressure of sunlight, or drawn together by the Mylar's "memory" of the way it was folded in the launching rocket. But a flattish or crumpled shape may continue to serve for years as a good radio reflector, which is the basic job that Echo was sent up to perform...