MOJAVE - XCOR Aerospace, home to cutting-edge rocket engine technology, is now the proud recipient of the nation's second space launch license. The company's neighbor at Mojave Airport, Scaled Composites, was granted the first-ever space launch license in April. XCOR's license differs somewhat in that it authorizes a rocket vehicle take-off from the ground. Scaled Composites' SpaceShipOne, in contrast, is air-launched from a carrier aircraft. The license also is unusual in that it was granted for a vehicle that is not yet built, said Rich Pournelle, XCOR's director of business development. "We've developed most of the technology to go inside...