Elon Musk retweeted a post outlining the key components of a K2 civilization (Kardashev Index Type II civilization), including launching massive amounts of material into orbit, large-scale solar cell production, AI chip production, millions of general-purpose humanoid robots, and mass drivers on the moon. He speculated that approximately 1 million Optimus robots plus 1GW of solar power would constitute the first Von Neumann probe, a system capable of self-replicating entirely from local materials on any sufficiently large planet or moon, which would enable civilization to expand throughout the galaxy and reach K3.