Word: xenon
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Dates: during 1950-1959
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...already discussing a preliminary contract. Sky stations could support search radars to watch for aircraft around the curve of the earth. A chain of them acting as microwave repeaters could carry TV programs and telephone conversations across continents and oceans. Fitted with big glass bulbs filled with neon or xenon gas, which glows red or blue when microwaves pass through it, they could serve as stratospheric lighthouses to guide aircraft flying above the clouds...