Voyager 2

Voyager 2, and its sister probe Voyager 1 were launched in 1977 to take advantage of a rare alignment of the outer planets, that allowed a probe to get a gravitational assist, to boost their velocity, at each encounter. Voyager 2 flew by Planet Jupiter, Planet Saturn, Planet Uranus and Planet Neptune. As of 2026 Uranus and Neptune have only been visited by Voyager 2.

As of 2026 Voyager 1 is over 150 astronomical units from the center of the Solar system, and is the most distant man-made object. Voyager 2 is a close second.

The Voyagers are powered by the heat from nuclear decay, and the availablle power has dropped over the decades, and scientist have had to shut down most of their instruments. But they remains in contact with NASA.