Voyager 1 and 2 were not sent to study a single planet. They were sent on a grand tour of the outer solar system, meaning they visited multiple planets.

Here's a breakdown:

* Voyager 1: Jupiter, Saturn, and then into interstellar space.

* Voyager 2: Jupiter, Saturn, Uranus, Neptune, and then into interstellar space.

So, while they did study each of those planets, they weren't specifically targeted at just one.