Labels:bulletin board | daily | encyclical | fence | pier | pole | reckoner | sea | sidewalk | sky OCR: called actually filled with thi ilarly, the interstellar med lium ong the gas in the empty are the galaxies in a cluster false intercluster medium ir und color image of the regio OTE Cygnus thin gas exter the than million light yea. galaxy's center Because very hot 100 billior Kelvin- -it is most easil small through X-r8.y telescopes white bar indicates len minutes The huge radi comparison measur fit minutes end to end and within the brightest ares image laxies mediur licht throuch telescope parison