New materials could be used to make buildings the Moon. Scientists Holland, Italy, Norway and Spain say a new kind concrete could be made moon dust and the urine passed astronauts. The scientists said there is a chemical compound human urine called urea. This could help things stick together to make a kind concrete. Scientists would use 3D printers to create the construction material. Three the world's main space agencies could start using this technique to make buildings a permanent moon base. NASA, the European Space Agency (ESA) and the China National Space Administration are all interested in colonizing the Moon research stations.
Using astronaut pee and moon dust could save scientists a lot money. It costs $10,000 to transport 0.45kg of materials Earth to the Moon. The urine and moon dust alternative would be a much cheaper way constructing things. A scientist said: "We have seen that a waste product, such as the urine the personnel who occupy the moon bases, could be used." She added: "The actual water the urine could be used the mixture, together with [water] that can be obtained on Moon, or a combination of both." Scientists say another source of water on the Moon is the ice that exists some areas. The scientists say they need to do more tests to find the best building material.