Board Thread:Fiction Universe Discussion/@comment-9141454-20150625191138/@comment-47205-20150627151326

9.63x106 t / 2.5 t m-3 = 3.852x106 m3 (so you got the units wrong, and the only thing more mysterious than where that 3 came from in your equation is where it disappeared to in your final answer). That corresponds to a cube just under 157 metres to an edge, so quite big but not that huge.