Science fiction is hard to define because it has a wide range of subgenres and themes.
That is true, although I think they fit under the general label of science fiction. Do you like science fiction?
Yes, I am really interested in it because I dislike supernatural themes and sci-fi avoids it. 
Yeah that's true. Have you seen 2001 space odyssey?
No, I have not, but I have heard it is very good, maybe I will watch it. One of my favorite TV series is Battlestar Galactica  which was about sci-fi and American military science.
Oh really? I watched i think the first two seaons or so, but got busy doing other stuff. I liked Gaius the most.
Battlestar Galactica
Battlestar Galactica is an American science fiction media franchise created by Glen A. Larson. The franchise began with the original television series in 1978 and was followed by a short-run sequel series ("Galactica 1980"), a line of book adaptations, original novels, comic books, a board game, and video games. A re-imagined version of "Battlestar Galactica" aired as a two-part, three-hour miniseries developed by Ronald D. Moore and David Eick in 2003. That miniseries led
Takahashi said that she had been dreaming about the overall universe of "Urusei Yatsura" since she was very young. She said that the series "really includes everything I ever wanted to do. I love science fiction because sci-fi has tremendous flexibility. I adopted the science fiction-style for the series because then I could write any way I wanted to". She wanted the reader to be completely surprised by the next panel and used slapstick comedy to create a reaction in the reader. When Takahashi ran out