This semester I'll be doing a lab project using a radio telescope to map out 21cm neutral Hydrogen in the galaxy to make a nice big image of it. (First proper hands on experiment ). Anyway thats the basic idea of it but I'm hoping in it to try to find something more specific in it. I've only just started reading into it but is there any interesting properties to go looking for in it? What can it tell us about the galaxy? The rotation curve is part of another experiment so I don't want to go too into that. Mapping it all is the main part but I'd like to have something more to say about it. Suggestions all very welcome!