PASADENA, Calif. - The Spirit rover's path to the surface of Mars remains blocked by airbags and it will have to turn and use a secondary ramp, but while still parked it has revealed the presence of minerals that may have formed in a lake believed to have once filled the landing site, NASA (news - web sites) said Friday. The first indications of the geologic makeup of Spirit's surroundings could support theories that liquid water persisted on the surface of the planet during its ancient past, providing an environment conducive to life. Scientists stressed that finding the minerals, called...