The following is a paper I wrote mainly to collect my thoughts and document some research I did about interstellar space flight. The main ideas for this paper grew out of the things I always hear people talk about (blueshifted radiation) but I never see the math behind it, so I developed a few models of my own. I wanted to keep the paper as theoretical (i.e away from any specific model of space flight. I don't care what method of propulsion is used, for example). For this reason the first section is a little more ambiguous than, say, the relativistic rocket page. I aim just to either a) get order of magnitude estimates or b) upper/lower bounds. That said, feel free to criticize and comment, but keep in mind my purpose isn't to be completely rigorous! http://docs.google.com/fileview?id=...jYtODE2NC00ZmRlLWI1ZDctOTRiZTRmZWNjMzll&hl=en Note: Admins if this is better suited for the independent research form I'm not sure, but I'll leave that up to you.