Having a node on another planet, under full control of humans, would be a great leap for Bitcoiners. ... When they settle there, they can use Bitcoin as the official currency
for trade. Imagine sending inter stellar transfers to other planets for people rendering services {programming .. etc} from Mars. Go big or go home.
Classic example of why we need sidechains - communication is too slow and too unreliable for people to mine the same blockchain on Mars that they're mining on Earth. Even with newer technology and optimized communication speeds, with minimized interference, there would be constant forks at best. And then there could be regular communications blackouts depending on the relative positions of the planets, so I don't think it would work. You'd need separate blockchains.
When people go to Mars, they would need to send their bitcoins to the Mars sidechain. Their transaction will take a while to reach Mars, but it will get there long before they do. Then they'll have coins on the Mars blockchain.
Then when they're ready to come back to Earth, they send their coins back from the sidechain to the original Bitcoin blockchain on Earth.
That's some real sci-fi optimism you got going on there buddy... maybe by then we could time travel back to 2009 to invest heavily into bitcoin so we'll be rich now But seriously... that would be awesome if people really do end up going to Mars with new politics, philosophy, and way of doing business there. Hurry up and be year 2050 already!!