Venus Express studied the atmosphere, the plasma environment, and the surface of Venus.

It found a surprisingly cold region high in Venus' atmosphere which could be cold enough for carbon dioxide to freeze as ice or snow.

JUICE is a European Space Agency mission to explore Jupiter and 3 of its Galilean Moons: Europa, Callisto, and Ganymede.

It will be the first spacecraft to orbit a moon of a planet other than Earth.

Voyager 2 is designed to find and study the edge of our solar system and beyond.

It's the only spacecraft to have studied all four of the outer planets at close range.

New Horizons is the first spacecraft to explore Pluto, its moons, and the Kuiper Belt object Arrokoth, the most distant object explored up close.