The same piece of software that lets people all around the world play video games on their cell phones is now letting scientists drive the ultimate remote-controlled car across the surface of Mars. Java, the software developed by Sun Microsystems Inc. in the mid-1990s as a universal platform for Internet applications, gave NASA a low-cost and easy-to-use option for running Spirit, the robotic rover that rolled onto the planet’s surface on Thursday in search of signs of water and life.