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First artificial Earth satellite.

First human spaceflight, carried Yuri Gagarin.

First manned Moon landing.

Provided detailed images of Jupiter and Saturn, on-going interstellar mission.

Revolutionized astronomy with clear images of the universe.

Rover missions that explored the Martian surface and geology.

First reconnaissance of Pluto and its moons, continuing to study the Kuiper Belt.

Discovered thousands of exoplanets in the habitable zone.

Advanced Mars rover mission, assessing habitability and studying climate and geology.

First human-made object to enter interstellar space.

First mission to land a probe on a comet.

First mission to visit and orbit two separate extraterrestrial bodies, Vesta and Ceres.

Joint mission by ESA and Roscosmos to study the Martian atmosphere and search for signs of life.

NASA's mission to search for exoplanets using the transit method.

NASA's mission to study the outer corona of the Sun.

Mission to study the Martian interior using seismology and other geophysical instruments.

First spacecraft to land on the far side of the Moon.

NASA's rover to seek signs of ancient life and collect samples of rock and regolith (broken rock and soil) for possible return to Earth.

Next-generation space telescope set to succeed the Hubble Space Telescope.

First spacecraft to reach the vicinity of the Moon and to orbit the Sun.

First successful planetary flyby to Venus, providing valuable data about the planet's atmosphere and temperature.

First spacecraft to orbit another planet (Mars).

First spacecraft to orbit Jupiter, provided extensive data on the planet and its moons.

First spacecraft to orbit Saturn, the Huygens probe landed on Titan, Saturn's largest moon.