When NASA’s New Horizons mission sent the first high-res images of Pluto to Earth in July 2015, Jani Radebaugh was awed with the rest of the world by the tiny planet’s massive heart-shaped glacier. As she looked more closely at additional images of the glacier in days, weeks and months to come, she noticed something else: dunes. This meant that the surface of Pluto is entirely different than scientists always expected.