We are nearing the boom of the Space Colonization Era. While it's not mandatory for bitcoin to work outside of the planet, it would be very interesting if it could scale that way. The problem at that point will solely consist on the delay of the signals. In the limit of full Solar System Colonization, asteroids belts included, all signals between celestial colonies will take hours to fully transmit, and full synchronization of the entire network may take days regardless of processing speed. Can bitcoin work with such a latency without becoming temporally exploitable by malicious actors? In the worst case scenario, malicious actors might want to just disrupt the network, not necessarily to take advantage from it, so such latencies might give them enough time to create enough false transactions within large non-yet-synchronized parts of the network to cause a complete Denial of Service? If there's no solution to this, it doesn't have to exist, maybe bitcoin will evolve to work as a network of relatively isolated planetary networks that might occasionally interact with other planets, and if in doubt the planet will become isolated from the multi-planetary network, a risk so big that will force "planetary nodes" to be good actors.