Coolant leaks, space debris collisions and unplanned engine thrusts are just some of the unexpected challenges astronauts aboard the International Space Station must overcome. NASA intends to build civilian housing on the lunar surface using 3D-printing robots within two decades, according to several of the organization's scientists. The agency is developing concepts for lunar rocket landing pads, 3D printers, concrete mixtures, construction robots and more to complete structures that would shelter humans on the moon by 2040, according to the New York Times. NASA plans to send a construction robot to the moon, which will use mineral fragments, dust and lunar concrete from the moon's surface to build the dwellings. The workroom inside of NASA's 3D printed Crew Health and Performance Exploration Analog habitat built by ICON.