Also, if you feel like more Lem after reading this, I heartily recommend the '72 Solaris film if you haven't seen it. Probably one of the greatest directors (Tarkovsky) of all time filming off of one of the greatest sci-fi authors of all time. Tarkovsky likes long, slow shots the style of which is all but absent from Hollywood today, where they cut like a microtome, so it might seem dull and strange at first, but give yourself a chance to get used to his pacing.