Mars 4 was a Soviet Mars orbiter launched on 21 July 1973; its retro-engine failed during approach, so it flew past Mars on 10 February 1974 and returned limited data.
Future launches and major activity directly linked to this vehicle family.
Mars 4 was a Soviet Mars orbiter launched on 21 July 1973; its retro-engine failed during approach, so it flew past Mars on 10 February 1974 and returned limited data.
Future launches and major activity directly linked to this vehicle family.