New images from the High Resolution Stereo Camera (HRSC) on ESA’s Mars Express spacecraft show an impact crater in the northern lowlands of Mars. Known as Korolev, this 51-mile (82 km) wide crater is filled with water ice all year round. Perspective view of Korolev crater. Image credit: ESA / DLR / FU Berlin / CC BY-SA 3.0 IGO. Korolev crater is located in the northern lowlands of Mars, just south of Olympia Undae, a large patch of dune-filled terrain...