Extraterrestrial cement (IMAGE) University of Delaware Caption University of Delaware researchers mixed simulated lunar and Martian soils with a high-pH solution to create geopolymer bricks, then crushed the bricks to see how strong they were. The experiments are helping them work on ways for astronauts to create building materials in space. Credit Photo illustrations by Jeffrey C. Chase/ University of Delaware Usage Restrictions Must credit Jeffrey C. Chase/ University of Delaware License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.