Word: vapor
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Dates: during 1960-1969
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...Venus have pictured it as hot and waterless, certainly not a place for any kind of life that is known on earth. But last week Venus got a kind word. Professor John Strong of Johns Hopkins University reported that the Venusian atmosphere has a large amount of water vapor above its sunlit cloud deck...
Earlier attempts to look for water on Venus had been frustrated by the masking effect of the abundant water vapor in the earth's lower atmosphere, but the 87,500-ft. level where the balloon-telescope took its pictures is above nearly all of the earth's vapor. Thus the spectral absorption that it photographed was almost entirely free from earthside confusion. Says Dr. Strong: "About 95% of the water that we saw was on Venus...
...uncomfortable fuel, liquid hydrogen. Space engineers admire LH2 because it provides better than one-third more thrust than kerosene, but it is hell to handle. It is so light (7% the weight of water) that it requires enormous tanks, elaborately insulated to keep the hydrogen from flashing to vapor. A long list of new materials had to be developed that would not lose their strength at the chilling touch...
...only the beginning, say satellite meteorologists. Future satellites will do even better. They will measure temperatures of the ground and the atmosphere. They will tell how dense the clouds are, and how high. They will show clouds on the dark side of the earth and measure changes of water vapor in the air. When all this new information is analyzed continuously by quick-thinking computers, meteorologists will at last be able to watch all the world's weather all the time...
...Webster now accepts "to happen" as a synonym, but gives "to emit moisture, vapor, perfume, etc." as the first definition...