On this week's podcast, Ars Technica's Jonathan Gitlin is joined by Ars' very own science editor John Timmer, as we discuss a particular science fiction trope he can't stand, and recap the latest goings-on with Eros, the UN on Earth, and the Mars soldiers on Ganymede. John also speaks with Dominique Tipper, who plays Naomi Nagata, whom he interviewed at NBC/30 Rock before the season started, about her overall thoughts on her character.