NASA’s InSight lander has taken a selfie on Mars NASA/JPL-Caltech

The main goal of NASA’s InSight lander, which arrived on the Red Planet in November 2018, is to measure underground heat flow and seismic activity. That isn’t going quite as planned, but the lander is using one of its less important sensors to make the very first measurements of Mars’s magnetic field from the surface, which may help us find water deep underground.

InSight’s main instrument, its seismometer, has not yet seen any sign of marsquakes. The heat probe, nicknamed “the mole”, is designed to burrow 3 …