Most ambitious mission yet to explore Mars on target to begin AFP

The most ambitious exploration of Mars will start late Saturday, when the first of two American robots arrives on the Red Planet to spend three months seeking traces of life. At the end of a 500-million-kilometer (300-million-mile) trip which has taken seven months, the robots, MER-A and MER-B, will be parachuted down in special probes at opposite sides of Mars.