Back when Jimmy Carter was President (and I remember that) a spacecraft, one of two, was launched to take advantage of the alignment of the solar sytem’s gas giants; Jupiter, Saturn, Uranus and Neptune.
The first of those, Voyager I, has been determined to have left the solar system. The first human-made object to have done so.
In many ways a poignant moment.
And, just to let you know the practicalities of space travel…it only took 36 years at 11 miles a second.
Although it will also someday be responsible for a really boring Star Trek plot.