 Tests show that the maximum compressive and flexural strength of the 'martian' geopolymer is comparable to that of common clay bricks.MMS or Mojave Mars Simulant was developed in 2007 to address some issues with JSC Mars-1.While JSC Mars-1 did simulate the color of Martian regolith, it performed poorly in many qualities, including its hygroscopic tendencies—it had undergone weathering that attracts water, making it more clay-like.