• June 6, 2013

    Episode 454: Hydrogen Clouds in the Neighborhood

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    Radio observations of the region between the two spiral galaxies nearest our own, Andromeda and Triangulum, have verified the presence of hydrogen gas clouds. The clouds are hard to find, since they are mostly composed of ionized gas that is difficult to detect. There is a trace of neutral hydrogen mixed in the clouds, and that material could be observed. The origin of the material is not completely clear – was the gas always there or did it get ripped out during a close encounter of the two galaxies?