Labels:bulletin board | encyclical | fence | pier | pole | sea | sidewalk | sky | skyscraper | water OCR: of8 and reveal the inner WO nebula, The cloud ion re 8 hydrogen ga.s (represent red surrounds the Trap Great Cluster at the heart of Nebula. Yellow, green gas represent progressively trate Without radio waves to the dust. astrononers and easily determine the loc size of this cloud The red ionized hydre sence called an HI region Th mers of such a region tells asti that hot young stars 3181 Ultraviolet radiation heats hydrogen atorms therm roundinggas clouds, to lose their outer ofior hydroger represen surounds radic determmine ners recion youne ther
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