The European Space Agency (ESA), among other organizations, has been experimenting with 3D printing objects and structures from simulated lunar and Martian soil. The soil, taken from volcanoes, is similar enough in composition to the extraterrestrial soil that it makes for good practice, allowing us to see if we can actually 3D print our homes and tools in space someday. So far, it's looking promising. In the most recent experiment, ESA scientists 3D printed bricks from pure simulated lunar soil, no additives, and cured them using nothing but concentrated sunlight via a special furnace. Read more at 3DPrint.com: http://3dprint.com/173267/3d-printed...sunlight-moon/