Nasa launched a couple of rockets in the late 70,s, Voyagers 1 and 2. One of them is still transmitting limited information back to earth from outer space. It's 12 or so trillion miles from Earth, a mere 17 light hours away, and it will pass it's first star in around 40,000 years time. It's travelling at 34,000 Mph.
Fuck me, that's a long way to travel in a day with no congestion and nothing to see for tens of thousands of years.
FWIW, though, I think there is intelligent life out there. I've seen a light in the sky looking like a star suddenly start moving at thousands of miles an hour and disappear over the horizon in a few seconds. I don't know what it was, it wasn't a Ryanair Boeing 737, but the universe has been around for 13.5 billion years or so.
We humans have been on Earth for 300,000 years, and it's only in the last few hundred years technology has advanced. We've been exploring space for the last 60 years, and we've been sending satellites onto our nearest planets for most of that time as well. Probes into space, and two of them are on their way to heaven knows where.
Artificial Intelligence is a new concept that's in its infancy on Earth, but it will develop over the coming centuries, and what I saw that night as that light in the sky pretending to be a star suddenly started it's incredible disappearing act, well, could that have been some artificial intelligence craft sent out to home in on radio waves or whatever from some distant planet with intelligent life more advanced than ours but with an understanding the distances involved in space travel are too much for beings to survive?
Maybe it is, who knows, but in the coming years, I wouldn't be surprised if we do something similar given the way AI is developing.