Curiosity observes a transit of Mercury

NASA’s Curiosity Mars rover has imaged the planet Mercury passing in front of the Sun, visible as a faint darkening that moves across the face of the Sun. This is the first transit of the sun by a planet observed from any planet other than Earth, and also the first imaging of Mercury from Mars. Mercury fills only about one-sixth of one pixel as seen from such great distance, so the darkening does not have a distinct shape, but its position follows Mercury’s expected path based on orbital calculations.… [More at link, including video]