The SciencesGalactic Gas CloudsA Complex System of Enormous Rarefied Clouds of Gas Moving at High Velocity Has Been DiscoveredBy Henry Norris Russell on August 1, 1943AdvertisementABOUT THE AUTHOR(S)Recent Articles by Henry Norris RussellAnthropocentrism's DemisePlanet CompanionsNature's Cross-Word Puzzles