@Draculaz: "the only thing I'm not sure about to be completely honest is whether you get hard or soft shadows in space." Shadows in a vacuum are 100% sharp ('cos there's nothing to bend/perturb those dead straight light rays). But they will still have variation within them, depending on the light source. If the light source is a pin-point, then the shadows will be 100% black (except where they get washed out by reflections from surrounding objects; even then the transitions would be sharp). If the light source is disc-like, then the shadows at the edges will still be sharp, but not at full density. Then they'll get gradually more dense as they move towards the centre. That's the umbra (the totally dark bit in the middle) and the pen-umbra (at the edges). The closer to the object, the larger the umbra. Hang on, I'll grab a picture...