Resources Hummocky Terrain in Vesta's Rheasilvia Quadrangle Photojournal: PIA15080 Source: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA Published: November 15, 2011 This image from NASA's Dawn spacecraft shows the hummocky (wavy/undulating) terrain of Vesta's Rheasilvia quadrangle, which is the south polar region. ENLARGE