I think this is one of the coolest things humanity has done or ever and maybe ever will do. I think these four spacecraft, (two Voyagers and two Pioneers), may very well exist longer than the human race itself.
Voyager 1 Probe May Have Left Solar System
Earth’s most distant spacecraft detected a sharp change in the intensity of fast-moving charged particles called cosmic rays, suggesting it had left the outermost reaches of the heliosphere marking the edge of the solar system. “Within just a few days, the heliospheric intensity of trapped radiation decreased, and the cosmic ray intensity went up as you would expect if it exited the heliosphere,” said Bill Webber, professor emeritus of astronomy at New Mexico State University
The scientists still don’t know for sure, however, whether the probe has entered interstellar space or if it remains in a mysterious in-between region Voyager team members first discovered a few months ago.
“It’s outside the normal heliosphere, I would say that,” said Professor Webber.
Article From HERE.
One of my favorite websites where I have been monitoring the Voyagers and the Pioneers is HERE. This website is also the best for getting info on viewing satellites in Earth orbit that you can see with the naked eye EVERY NIGHT! It’s called Heavens Above