In performing the research for my 20-page postcolonial paper (due exacatly 7 days and 2 hours from now), I've been reading my way through John Reider's "Colonialism and the Emergence of Science Fiction." It's a great book, and it'll prove very useful to the paper--I'll probably do a full review of it at some point. For now, it's enough to know that Reider believes he sees, in sf tropes such as time travel and aliens, an attempt to engage colonial views and challenge perceptions of race. I'm pretty sure this is exactly what he means:
Thanks to Ye Olde Comick Booke blogge, for introducing me to this wonderful example of the most versatile of mediums. This has been such a better use of my time than any silly paper.