Prop-M (ieee.org) TFA the rover was part of the Soviet Union's Mars-3 mission (ieee.org) Prop-M Prop-M (ieee.org) Prop-M Prop-M (ieee.org) the rover was part of the Soviet Union's Mars-3 mission (ieee.org) (ieee.org) Prop-M Prop-M Prop-M (ieee.org) (ieee.org)