Belarusian explorers Severnaya Zemlya Soviet astronomers Soviet mathematicians Belarusian astronomers 20th-century Belarusian mathematicians Soviet geophysicists Franz Josef Land Kara Sea Laptev Sea Chukchi Sea East Siberian Sea Taras Shevchenko National University of Kyiv alumni Academic staff of Moscow State University Academic staff of Moscow State Pedagogical University Full Members of the USSR Academy of Sciences Heroes of the Soviet Union Recipients of the Order of Lenin