TY JOUR TI OBJECTIVES AND ROLE OF EMERGENCY SITUATIONS MINISTRY IN SOLVING URGENT PROBLEMS OF SAFETY POPULATIONFROM SPACE THREATS KW meteorite KW meteorite threat KW asteroid KW comet KW space risks KW dangerous cosmic phenomena KW asteroid and comet security JO NATURAL AND MAN-MADE RISKS (PHYSICO-MATHEMATICAL AND APPLIED ASPECTS) AU Medvedeva, L.V. AU Kholshevnikov, K.V. AU Sokolov, L.L. PY 2013 IS 2013 PB Saint-Petersburg University of State Fire Service of Emercom of Russia