Sept. 2 (UPI) -- Seattle-based natural resources firm Interlune will build a Texas facility to develop and test imitation moon dirt near NASA's Johnson Space Center in Houston. The imitation moon dirt will support the development and testing of technologies and equipment for use of the moon's surface and an eventual mission to Mars, among other possibilities. A $4.84 million grant from the Texas Space Commission, combined with internal funding by Interlune, will enable the firm to build a