Editing Mars program (section)

===Mars 3MS===
[[Image:Mars 4-5.jpg|thumb|right|[[Mars 4]] and [[Mars 5]]]]
The Mars 3MS were orbiter-only spacecraft launched three times between 1971 and 1973. The first of which,
Kosmos 419, was intended to become the first spacecraft to orbit Mars, beating NASA's [[Mariner 8]] and [[Mariner 9]], however it failed to leave low Earth orbit.<ref name=nssdc-c419/> Two additional 3MS missions, Mars 4 and Mars 5, were launched in 1973 to act as communications relay for Mars 6 and 7.

{| class="wikitable sortable"
! Public name
! Internal name
! Mission
! Launch date
! Carrier rocket
! Outcome
! Remarks
|-
| [[Kosmos 419]] || 3MS No.170 || Orbiter || 10 May 1971 || [[Proton-K]]/[[Blok D|D]] || {{Failure}} || Stranded in [[low Earth orbit|LEO]] after its [[Blok D]] stage malfunctioned. Reentered two days later on 12 May 1971
|-
| [[Mars 4]] || 3MS No.52S || Orbiter || 21 July 1973 || [[Proton-K]]/[[Blok D|D]] || {{Failure}} || Did not insert itself into orbit around Mars due to propulsion failure on 10 February 1974. Closest distance to the planet was 1,836 km and returned only 12 images back to Earth<ref name=Images/><ref name=nssdc-m4/>
|-
| [[Mars 5]] || 3MS No.53S || Orbiter || 25 July 1973 || [[Proton-K]]/[[Blok D|D]] || {{Success}} || Successfully inserted into a 1,755 x 32,555 km elliptical orbit on 12 February 1974, returning 60 images of the planet's surface.<ref name=Images/> Collected data until it suffered a systems failure that ended the mission on 28 February 1974<ref name=nssdc-m5/>
|}