NanoRocks experiment. (a) Experiment hardware before closing the flight unit: the camera and electronics can be seen at the bottom of the picture (1), while the tray (2) and its springs (4) and magnet (3) are at the top. (b) Recorded image of the experiment tray containing the eight particle samples during an experiment run on ISS. The experiment cell numbering is shown (black numbers in white boxes) as well as the particles tracked manually in each cell (white numbers).