Koroljovkratern is named after the Russian chief engineer Sergei Koroljov who was the man behind the Russian initiative on space. When the US and the erstwhile Soviet union competed to be first to the moon, it was Koroljov who designed the first ships and became head of the Soviet space program until his death in 1966.
The crater that he got named after him is located just to the south of the planet's north pole and is 820 kilometres across and 20 miles deep from the kraterkant to the bottom.
the crater's bowels of the earth is covered by ice. A 1.800 metre thick layer of frozen water, writes CNN. The crater's location makes the ice in it never melts.
the Image was taken by ESA's Mars Express and consists of photos taken during the five laps in april of this year. Mars Express was sent up from the earth in June 2003 and reached Mars on 25 december of the same year.