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Most of the neutral Hydrogen in the Local Group is contained in the disks of the large spirals, but there are important exceptions, some of which are tied to basic processes in galaxy evolution. After giving a brief survey of recent science with the Green Bank Telescope, I’ll discuss the different populations of neutral hydrogen that are found outside the disks of galaxies in the Local Group. The most puzzling are the clouds found between M31 and M33, which have the mass of dwarf galaxies but contain no stars. |
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