Word: violet
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...compounding the problems of eclipse observation with the problems of ultra-violet rocketry, and just for spice, adding in the difficulties of a water recovery," he added...
...foot tall Acrobec rocke? equipped with special ultra-violet light cameras, designed in part at the Harvard College Observalory, will arrive at NASA's missile range on Wallop's Island, Virginia next week. Edmond M. Reeves and William H. Parkinson, lecturers on Astronomy, are participating in the joint Canadian-British American rocket project that will observe the sun's chromosphere-a thin, outer layer of the sun that is distinguishable only during an eclipsc...
Even during an eclipse, the chromosphere's strong ultra-violet light emissions are blocked out by the earth's atmosphere. Thus a rocket or satellite is needed for studying this region...
...telescope cameras have sent back nearly 5000 ultraviolet pictures, primarily photographing the stars lying in the plane of the Milky Way. A satellite was necessary to obtain these pictures because the earth's atmosphere blocks most types of ultra-violet light and makes ground observations in ultra-violet wave-lengths impossible...
...satellite's cameras have photographed star clusters, especially the Orion and Pleides star associations. Ultra-violet pictures were taken of the moon, but they showed nothing surprising, Davis said...