Icy Mars Korolev crater is 51 miles across -.Soviet rocket scientist Sergei Korolev.

Ice Cap: The most distinctive feature of Korolev Crater is its central ice cap, which persists throughout the Martian year. This ice cap is composed mainly of water ice and is estimated to be several kilometers thick.

All-Year Ice: Unlike many Martian ice features that wax and wane with seasonal changes, Korolev Crater's ice cap is relatively stable. This permanence is due to the unique geographical and climatic conditions at the Martian north pole.