Launched in 1977, the Voyager probes embarked on a journey unlike any in human history. Over four decades later, they continue to send data from interstellar space, offering insight into the outer ...

The planets are not exactly lined up, ... led to Nasa launching the twin Voyager 1 and 2 spacecraft in 1977 on a "Grand Tour" of the outer Solar System.

In 1977, NASA had launched a twin spacecraft, Voyager 1 and 2, to take a "grand tour" of the outer Solar System on the occasion of a similar planetary alignment of Jupiter, Saturn, Uranus and Neptune.