Voyager 2 launched on August 20, 1977, and Voyager 1 followed on September 5, 1977, for what was originally a five-year mission to study Jupiter and Saturn.  They gave us some awesome pictures.

Voyager 2 was Earth’s first visitor to Neptune and its Great Dark Spot.

Both craft included two cameras, one with a wide-angle lens.

Io volcano and the Io torus 
Here’s a closer look at an inactive volcano on Io. The moon has about 100 times the volcanic activity as Earth.

It is believed that Jupiter’s surface may be covered by a water ice crust of up to three miles–hiding oceans as deep as 30 miles.

Great Red Spot 
This was the closest view of the old and massive storm that gives Jupiter its trademark red spot.

Jupiter's ring
Voyager photographed a ring around Jupiter.

This Voyager 1 photo from 1980 showed the fuzzy layer of atmosphere on Saturn’s moon, Titan.

This is a true-color view of Uranus from Voyager 2.