This mission was consisted of two Viking spacecraft named as Viking 1 and Viking 2. Viking 1 was launched on August 20, 1975 and Viking 2 was launched September 9, 1975. Both were having their orbiter and lander attached to it. Viking 1 when reached at Mars it started working by searching appropriate place for itself to be landed. It planned to land a place but later it was discovered that it was little rocky and sloop, so it searched for another land. Finally it landed on place known as Chryse Planitia. It started working and landed on Mars on August 17, 1980 and the lander stayed there until November 13, 1982. It is the first rocket or spacecraft to arrive at the Mars securely.
Viking 2 landed on the planet at the place known as Utopia Planitia. It took several photos, and did research on the surface of Mars and Martian atmosphere to learn that is there any sign of life in near future or in past. There were two indistinguishable shuttle, each comprising of a lander and an orbiter, were fabricated. Every orbiter-lander match flew together and entered Mars circle; the landers at that point isolated and slid to the planet’s surface. It ended up working on Mars because its batteries stopped working and ended up on April 11, 1980.. It brought about hundreds of photos back.