As of now, Bitcoin is the cryptocurrency with the most nodes available worldwide. It's been doing well with only 10 years since its inception. However, I believe that in order for Bitcoin to reach true censorship-resistance and reliability, it needs to expand in areas far beyond reach. It would be nice to have Bitcoin nodes distributed across space in order to be prepared for any catastrophic event on Earth. Imagine having Bitcoin nodes on the Moon, as well as, planets like Mars and Venus. This would allow Bitcoin to stand the test of time for generations.
However, it's yet to be proven if this solution is viable after all. What are your thoughts?
With current technology, the main problem would be the latency. To the moon its measured in seconds (not milliseconds), to Mars in minutes, half an hour to an hour. Syncing the blockchain on a solar system wide level would be very difficult, not impossible, but tricky. You could easily have two blockchains running in parallel on Mars and Earth at the same time for long enough periods to do harm. This is definitely something that was not in Satoshi's mind.
One promising future technology that could fix this, is communications based in the properties of quantum entanglement. So yes, not all "quantum" stuff is evil, quite the opposite in fact.
The reasoning about a catastrophic event is unnecessary, if such thing occurs there would be far more pressing issues than keeping the Bitcoin network alive. No, but if in a few centuries later humanity starts populating the system, it becomes important. For interstellar distances you can pretty much forget it, you would be fighting against time itself... Unidirectional communication could be theoretically possible thought.
I can imagine a future where some colonies are setup both in space, such as artificial places at lagrange points, and in some suitable places like Jupiter moons, Mars, etc. As i said earlier, without quantum entanglement communications take minutes to hours to reach points. Even communication from earth to earth using satellites is laggy due to the distance it takes to reach orbit and back, or if needs to be relayed further. This is a physical issue, nothing can be done to lower the latency (short of quantum entanglement), bandwidth/bitrates can be improved, but not latency the speed of light (assumed constant) is in the way...
Did you know? Light from the Sun takes 8 minutes to reach Earth? Yes light, just a different wavelength... But the Sun is in the center, what you do when Earth is opposite to Mars? You already have those 8 minutes plus the longer distance towards Mars... And when the astrophysics start measuring in LightYears, better get ready because that's actual Earth years that light takes from point a to point b... Before taking in consideration time relativity.
Don't worry, if we don't go extinct, our descendants will have fun figuring clever ways to overcome this. Most fiction and even some science-fiction tends to ignore this. Star Trek instant bidirectional communications with Earth? They better have full dominance of quantum entanglement, else...