Dunes across the Solar System

Before NASA's New Horizons mission, the surface of Pluto was shrouded in mystery. No one knew what to expect from its surface and most scientists shied away from detailed speculation, except to say that the one thing we should expect is to be surprised (1). On page 992 of this issue, Telfer et al. (2) present such a surprise by describing features interpreted as dunes on Pluto's surface.