I heard of Voyager 2 and the fact that it was still functional: 30 years after it left Earth! Just that is amazing to me.
The craft went through the termination shock several times now (5 if I’m correct). This is far. Further away from the Sun than Pluto. And Pluto is on average around 39.5 AU from the Sun. It is even further than Eris and Eris lies at about 67 AU on average.