The latest mission to Mars, InSight, is shown on the surface of the Red Planet in this artist's concept. The lander, which is scheduled for launch as early as May 5, is designed to probe the Martian interior, providing new insights into Mars' structure and evolution. Its instruments include a seismometer (small white dome on the surface, at left) and a heat probe (drilling below the surface, at right, shown in cutaway). They will measure marsquakes and take the planet's temperature. After launch from Vanderberg Air Force Base in California, InSight will land on Mars on November 26. [NASA/JPL]