Back To Mars

This view of the Martian landscape was taken by NASA's Opportunity in 2004. One of a pair of roving robots, it landed in the Meridiani Planum region and proved conclusively that it was once under water.

and Saturn in 1980—81. Voyager 2 went on to become the first and only probe to visit Uranus and Neptune.

In 1986, an international flotilla of space probes set out to greet the return of Halley's comet. The highlight was the European Giotto probe, which returned the first pictures of Halley's nucleus, and paved the way for other missions to comets and asteroids. NASA finally returned to Mars in 1997 with the Mars Pathfinder lander, the first in a series of

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