The twin Voyager probes were launched in 1977 to exoplore the outer Solar System. They are still operational today as they cruise into interstellar space. | NASA

Voyager Probes Give Us ET's View

The Voyager probes give us ET's view. Learn more about the outer planets with the Voyager probes which give us ET's view.

December 1, 2011
3:00 AM EST