Word: vapor
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Dates: during 1970-1979
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Observation of far-infrared radiation is impossible to make from the ground because of obstructive water vapor. The balloon will rise above this vapor at an altitude of 18 miles, Noyes said...
...Vapor Trails. In the North Vietnamese capital, 60 miles inland, loudspeakers urgently awakened the sleeping city: "Comrades, attention! The enemy is near Hanoi." At 9:30 a.m., the second wave of the U.S. air assault appeared. This time the raiders were 32 Air Force F-4 Phantoms, far nimbler than the high-and blind-flying B-52s; for nearly half an hour they bombed and strafed warehouses and petroleum storage areas on the outskirts...
...than an hour, 40 Navy jets from carriers wheeled around the city, pummeling warehouses, a huge truck park and nearby Kien An Airfield, where three MIG-17 fighters were destroyed on the ground. By the time the third attack had ended, the sky over Haiphong was streaked by the vapor trails of SAM missiles...
...Like a vapor trail in a clear winter sky, a trace of the supersonic transport lingers on. Congress shot down the SST last spring after a titanic propaganda battle between environmentalists and the aerospace industry. But one weapon in the fight, a pro-SST primer published in 1969, is still being used in some of the nation's elementary schools...
Discovery of the valley has increased speculation that water-dependent forms of life may once have existed-or still exist-on Mars. That possibility has also been strengthened by readings from Mariner's instruments. They indicate that about 100,000 gallons of water vapor escape daily into space from the Martian atmosphere. Scientists believe that the vapor and carbon dioxide are being continually vented from volcanoes in the same kind of process that created the earth's early atmosphere...