Viking 1 & 2
Two orbiters and two landers: detailed images, atmospheric measurements and biological experiments. These experiments did not establish a discovery of life.
Source ↗From the first images to mobile laboratories: milestones in robotic exploration.

A historical selection ordered by arrival or landing year. It does not describe the spacecraft’s current operational status.
Two orbiters and two landers: detailed images, atmospheric measurements and biological experiments. These experiments did not establish a discovery of life.
Source ↗Landing on 4 July. Sojourner became the first rover to explore Mars, paving the way for larger vehicles.
Source ↗Arrival in orbit in December. The European mission investigates the surface, subsurface, atmosphere and moons.
Source ↗Two rovers landed in January to seek evidence of past water activity in different regions.
Source ↗Landing in Gale on 6 August UTC. The mobile laboratory analyses rocks and past habitability.
Source ↗Orbit insertion in September. Upper-atmosphere research helps explain atmospheric escape into space.
Source ↗The UAE probe reached Mars orbit on 9 February to study the atmosphere and its variations.
Source ↗The Chinese mission arrived in orbit in February; its lander and Zhurong rover landed in May.
Source ↗Landing in Jezero in February. Perseverance studies rocks and collects samples; Ingenuity demonstrated powered flight in the Martian atmosphere.
Source ↗Space-mission images; mosaics and processing are identified in the credits. NASA/JPL · Image use
Educational reference values and sources checked on 23 October 2026.