Voyager.

[M Gregg]

Just for interest,

How Do We Know When Voyager Reaches Interstellar Space? - NASA Jet Propulsion Laboratory


Regards
M. Gregg

 

[TehSmokeyMan]

Completely forgot that one is still operating (although if it kicked the bucket, there'd be so much lag we wouldn't know it for quite some time 🙂 ).

Good to see we're still exploring that final frontier.