Every few months some bright-eyed visionary announces that …

Every few months some bright-eyed visionary announces that Earth and Mars will be united by one glorious Bitcoin network.
Then physics walks into the room and starts breaking furniture.
At closest approach, a signal between Earth and Mars takes several minutes. At other times it takes over twenty minutes one way. Round trip? Roughly forty-four minutes or more depending on where the planets happen to be.
Bitcoin doesn't negotiate with astronomy.
If your network latency is longer than your block interval, you're not running one tightly synchronized system. You're running separated systems that diverge, reconcile, diverge again, and spend half their lives arguing about whose history is current.
The people promoting this stuff always speak as if reality is a software bug waiting for a patch.
It isn't.
You don't beat the speed of light with optimism. You don't solve orbital mechanics with hashtags. You don't build an interplanetary monetary system by chanting "decentralization" at a telescope.
The funny part is that most of the people talking about Mars Bitcoin haven't built anything on Earth worth discussing.
Mars has become the technological equivalent of a teenager planning where he'll park his Ferrari before he learns to drive.
The whole conversation is a boondoggle wrapped in science-fiction marketing. But even if it weren't, the basic problem remains:
Earth and Mars are too far apart to operate as a single Bitcoin network under the assumptions people keep making.
Physics gets a vote.
And unlike the developers, physics doesn't care about your roadmap.