Word: cloudier
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Dates: during 1950-1959
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...only flying saucers which Menzel's theory does not explain are the green fireballs that have been reported with extraordinary frequency in the Southwest. But Menzel does not take them very seriously. In clear-aired New Mexico and Arizona, he says, meteors are seen oftener than in cloudier places. According to Menzel's colleague, Meteor Expert Fred Whipple, they often look green because of vaporized magnesium from their stony material...