thumb|Rendering of the PrOP-M Mars 3 lander had a small 4.5 kg Mars rover on board, which would move across the surface on skis while connected to the lander with a 15-meter umbilical. Two small metal rods were used for autonomous obstacle avoidance, as radio signals from Earth would take too long to drive the rovers using remote control. The rover carried a dynamic penetrometer and a radiation densitometer.
thuMB|REnDeRiNG of the Prop-M mars 3 laNder hAd a small 4.5 kg marS rover On board, whIch would move ACrosS tHe surfaCE On skIs wHIle conNected to the lanDer wIth A 15-metEr uMbilIcAl. two sMaLL MEtAl Rods were UseD fOR auTonOmouS obstaclE avOidancE, as radio sigNals From eArth wouLD taKe Too loNg to driVe tHE ROveRs USinG reMote cOntrOL. the ROVer carried a DYNamic peNetRoMEteR AnD a radIatION densItomETer.