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New materials could used to make buildings on the Moon. Scientists from Holland, Italy, Norway and Spain a new kind of concrete could be with moon dust and the urine by astronauts. The scientists said there is a chemical compound in human urine called urea. This could things stick together to a kind of concrete. Scientists would 3D printers to the construction material. Three of the world's main space agencies could using this technique to make buildings for a permanent moon base. NASA, the European Space Agency (ESA) and the China National Space Administration all interested in colonizing the Moon with research stations.

Using astronaut pee and moon dust could scientists a lot of money. It about $10,000 to transport 0.45kg of materials from Earth to the Moon. The urine and moon dust alternative would a much cheaper way of constructing things. A scientist said: "We have that a waste product, such as the urine of the personnel who the moon bases, could used." She added: "The actual water in the urine could used for the mixture, together with [water] that can be obtained on the Moon, or a combination of both." Scientists say another source of water on the Moon in the ice that exists in some areas. The scientists say they to do more tests to the best building material.

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