selling simulants and was acquired by the Sierra Nevada Corporation. An 8-ton sand box of commercial JSC‐1A is available for daily rental from the NASA Solar System Exploration Research Virtual Institute (SSERVI). JSC-1A can geopolymerize in an alkaline solutions resulting in a hard, rock-like, material. Tests show that the maximum compressive and flexural strength of the 'lunar' geopolymer is comparable to that of conventional cements. JSC-1 and JSC-1A are now no longer available outside of NASA centers. NU-LHT and OB-1 Two lunar highlands simulants, the NU-LHT (lunar highlands type) series and OB-1 (olivine-bytownite) were developed and produced in anticipation of the Constellation activities. Both of these simulants are sourced mostly from rare anorthosite deposits on the Earth. For NU-LHT the anorthosite came from the Stillwater complex, and for OB-1 it came from the Shawmere Anorthosite in Ontario. Neither of these simulants were widely distributed. Recent simulants Most of the previously developed lunar simulants are no longer being produced or distributed outside of NASA. Multiple companies have tried to sell regolith simulants for profit, including Zybek Advanced Products, ORBITEC, and Deep Space Industries. None of these efforts have seen much success. NASA is unable to sell simulants, or distribute unlimited amounts for free; however, NASA can award set amounts of simulant to grant winners. Several lunar simulants have been developed recently and are either being sold commercially or are available for rent inside large regolith bins. These include the OPRL2N Standard Representative Lunar Mare Simulant and Standard Representative Lunar Highland Simulant. Off Planet Research also produces customized simulants for specific locations on the Moon including lunar polar icy regolith simulants that include the volatiles identified in the LCROSS mission. Other simulants include Lunar Highlands Simulant (LHS-1) and Lunar Mare Simulant (LMS-1) produced and distributed by the not-for-profit Exolith Lab run out of the University of Central Florida. See also Lunar soil Martian regolith simulant Moon rock References Further reading Concrete Materials science Space colonization